Lexical Competition & Interference | Why Similar Words Compete

LEXICAL COMPETITION · INTERFERENCE · SIMILAR WORDS · SEMANTIC COMPETITION · PHONOLOGICAL NEIGHBOURS · ORTHOGRAPHIC NEIGHBOURS · FALSE FRIENDS

Lexical competition occurs when several word representations become active at the same time and compete for recognition or production. Lexical interference is the cost created when those competitors slow, distort or block selection of the intended word. Competition is normal: a rich lexicon is connected, not isolated.

The same similarity that produces interference can also produce facilitation. Related meanings can prime one another; familiar sound patterns can support recognition; cognates can speed access across languages. The educational problem is therefore not to eliminate similarity but to help the learner discriminate accurately among plausible alternatives.

This guide explains semantic interference, phonological competition, orthographic neighbours, morphological competition, false friends, semantic grouping, bilingual lexical competition, retrieval-induced forgetting and contrastive learning. Existing eduKateSG specialist articles on semantic grouping, neighbourhood density and bilingual lexical control remain untouched.

A strong lexicon is not a silent shelf. It is a crowded room in which the right word wins quickly.

2. What lexical competition is

Lexical competition occurs when several word representations become activated at the same time and compete for recognition or production. Competition is normal: a target rarely exists in isolation inside the mental lexicon.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

3. Facilitation and interference can coexist

Related words can help by activating useful structure and hurt by activating plausible alternatives. Similarity is therefore not inherently good or bad; the effect depends on task, timing and learner knowledge.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

4. Semantic competition

Words with related meanings can compete during learning and retrieval. Teaching several close items together can strengthen category structure while also increasing substitution errors.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

5. Phonological competition

Words with similar sounds can compete during listening and speaking. Partial activation of neighbours can slow selection or produce slips.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

6. Orthographic competition

Similar spellings can activate competing candidates during reading and writing. One-letter neighbours can facilitate familiar patterns or increase confusion.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

7. Morphological competition

Related forms such as economic/economical or affect/effective can compete because they share structure while serving different grammatical and semantic jobs.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

8. Cross-language competition

For multilingual speakers, lexical items from several languages can become active together. Cross-language similarity can facilitate access, while competing alternatives can also interfere.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

9. False friends

A familiar form from another language can activate the wrong meaning. The strongest interference sometimes comes not from unfamiliarity but from misleading familiarity.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

10. Semantic grouping

Learning several members of one semantic category together can increase organisation but also confusion. Spacing and explicit contrast can reduce the cost.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

11. Neighbourhood density

Dense phonological, orthographic or semantic neighbourhoods create more competitors. Density effects can help recognition through familiarity and hinder selection through competition.

The practical implication is diagnostic: if an error reflects competition, more exposure to the target alone may not be enough. The learner may need a task that makes the competitor visible and forces a reasoned distinction.

12. Retrieval-induced competition

Practising one item can temporarily make related unpractised items harder to retrieve in some conditions. This shows that retrieval reshapes the competitive landscape, not merely the target trace.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

13. Selection under pressure

Speaking and timed writing increase competition because lexical choice must happen quickly. A learner may know several candidates but fail to select the best one in time.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

14. Competition in comprehension

Readers and listeners often activate multiple interpretations before context settles the target. Efficient processing involves rapid rejection of unsuitable competitors.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

15. Competition and proficiency

Competition changes as the lexicon develops. Beginners may be more affected by form similarity; more proficient learners can show stronger semantic competition as meanings become richly connected.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

16. Competition and frequency

High-frequency candidates often activate quickly and can intrude on lower-frequency targets. This is one reason rare precise words can be hard to retrieve beside common broad alternatives.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

17. Competition and register

Several words may fit the proposition but differ in register, collocation or stance. Selection therefore includes social and rhetorical competition, not just semantic competition.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

18. Competition is useful

A lexicon without competition would also lack rich connection. Related alternatives allow paraphrase, prediction and flexible comprehension. The educational goal is controlled competition, not isolation.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

19. Teaching

Teach similar words with diagnostic features: what differs, where each appears and which competitors should be rejected. Contrastive retrieval is often more useful than memorising several separate definitions.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

20. AI-era competition

AI can generate dozens of alternatives instantly, increasing external competition. Learners need stronger selection criteria so synonym abundance does not replace lexical judgement.

Competition should be tested under both recognition and production conditions. A learner may choose correctly when alternatives are visible yet still select the wrong item during free speaking or writing.

21. Competition casebook — Cases 1–20

1. economic / economical

Competition type: semantic + morphological. Problem: related adjectives with different meanings and collocations. First repair: contrast systems/finance with saving resources.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

2. historic / historical

Competition type: semantic boundary. Problem: near-neighbours with overlapping but non-identical use. First repair: compare important event vs relating to history.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

3. affect / effect

Competition type: phonological + orthographic. Problem: similar forms with different common grammatical roles. First repair: contrast verb affect and noun effect.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

4. complement / compliment

Competition type: phonological. Problem: homophones with unrelated meanings. First repair: pair completion vs praise.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

5. principal / principle

Competition type: phonological. Problem: homophones with different lexical fields. First repair: person/main vs rule.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

6. stationary / stationery

Competition type: phonological. Problem: same sound, different spellings. First repair: not moving vs writing materials.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

7. accept / except

Competition type: phonological + orthographic. Problem: minimal form contrast. First repair: receive/agree vs exclude.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

8. advice / advise

Competition type: phonological + orthographic. Problem: noun/verb pair. First repair: contrast sound, spelling and grammar.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

9. practice / practise

Competition type: orthographic + grammatical. Problem: variety-sensitive noun/verb distinction. First repair: teach target variety explicitly.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

10. lose / loose

Competition type: orthographic + phonological. Problem: similar spelling with different vowel/consonant patterns. First repair: contrast verb loss vs adjective not tight.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

11. quiet / quite

Competition type: orthographic. Problem: transposed-looking forms. First repair: calm vs degree adverb.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

12. then / than

Competition type: orthographic + phonological. Problem: high-frequency function neighbours. First repair: time sequence vs comparison.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

13. weather / whether

Competition type: phonological. Problem: homophones. First repair: climate vs alternative/condition.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

14. there / their / they’re

Competition type: phonological. Problem: three-way homophone competition. First repair: location, possession, contraction.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

15. its / it’s

Competition type: orthographic. Problem: apostrophe competition. First repair: possessive vs contraction.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

16. your / you’re

Competition type: phonological. Problem: possessive vs contraction. First repair: sentence role contrast.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

17. form / from

Competition type: orthographic. Problem: letter transposition. First repair: noun/verb form vs preposition source.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

18. trial / trail

Competition type: orthographic + phonological. Problem: letter-order neighbours. First repair: test/legal event vs path.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

19. desert / dessert

Competition type: orthographic + stress. Problem: similar forms and pronunciation patterns. First repair: dry region/abandon vs sweet course.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

20. adapt / adopt

Competition type: phonological. Problem: similar verbs. First repair: adjust vs take up/choose.

Activation test: present the target and its competitor separately, then together. If errors rise when both are active, the problem is competition rather than simple absence of knowledge.

Boundary test: ask the learner to state the feature that distinguishes the two items. A usable contrast should be semantic, grammatical, phonological, orthographic or register-based—not just “they are different.”

Production test: cue the intended meaning without showing either form. Free selection exposes whether the correct lexical candidate can win without multiple-choice support.

Delay test: retest after time has passed. Competition that disappears only during immediate rehearsal has not been durably repaired.

Transfer: find another pair with the same competition type and apply the same diagnostic rule.

22. Competition casebook — Cases 21–40

21. allusion / illusion

Competition type: phonological. Problem: related-looking abstract nouns. First repair: indirect reference vs false perception.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

22. elicit / illicit

Competition type: phonological. Problem: similar sounds across word classes. First repair: draw out vs illegal.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

23. emigrate / immigrate

Competition type: semantic + phonological. Problem: perspective pair. First repair: leave vs enter a country.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

24. imply / infer

Competition type: semantic converse-like confusion. Problem: speaker/writer vs reader/listener action. First repair: source vs interpretation.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

25. borrow / lend

Competition type: semantic relational competition. Problem: same event from different roles. First repair: recipient vs source.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

26. bring / take

Competition type: deictic competition. Problem: movement relative to reference point. First repair: toward vs away/current perspective.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

27. say / tell

Competition type: semantic + grammatical. Problem: speech verbs with different complementation. First repair: say something vs tell someone.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

28. speak / talk

Competition type: semantic. Problem: overlapping communication verbs. First repair: register and construction contrast.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

29. make / do

Competition type: collocational. Problem: broad verbs compete in L2 production. First repair: learn phrase patterns.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

30. job / work

Competition type: semantic + grammar. Problem: countable role vs mass/activity. First repair: contrast countability and collocation.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

31. fun / funny

Competition type: morphological. Problem: related forms with different senses/classes. First repair: enjoyable vs amusing/strange.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

32. sensible / sensitive

Competition type: phonological + cross-language risk. Problem: similar forms, unrelated common meanings. First repair: practical vs responsive/easily affected.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

33. actual / current

Competition type: cross-language false-friend risk. Problem: actual may be confused with current in some L1s. First repair: verify English meaning ‘real’.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

34. eventually / possibly

Competition type: cross-language false-friend risk. Problem: form triggers wrong cognate mapping. First repair: teach time outcome vs possibility.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

35. sympathetic / nice

Competition type: cross-language semantic mismatch. Problem: cognate-like forms vary across languages. First repair: teach compassion/understanding.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

36. fabric / factory

Competition type: cross-language interference. Problem: familiar-looking forms can map incorrectly. First repair: verify target-language concept.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

37. embarrassed / pregnant

Competition type: classic cross-language false-friend domains. Problem: wrong cognate activation can be socially costly. First repair: teach high-salience contrast.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

38. assist / attend

Competition type: cross-language interference. Problem: related forms may map to different concepts. First repair: verify participation vs help.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

39. library / bookstore

Competition type: semantic field. Problem: related places compete for weaker learners. First repair: books borrowed vs sold.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

40. kitchen / chicken

Competition type: phonological. Problem: similar sound sequence for some learners. First repair: place vs animal/food.

Interference direction: determine whether A intrudes on B, B intrudes on A, or both. Competition is often asymmetric because frequency and familiarity differ.

Context test: build two sentences where only one item fits naturally. Context should amplify the distinctive feature rather than merely repeat a dictionary definition.

Form test: if sound or spelling similarity contributes, practise discrimination before free production. Learners need stable perceptual categories before fast selection.

Cross-language test: if another language is involved, identify whether the resemblance is a true cognate, partial cognate or false friend. Familiarity can facilitate or interfere depending on mapping accuracy.

Repair criterion: require accurate selection across several contexts, not one memorised pair.

23. Competition casebook — Cases 41–60

41. ship / sheep

Competition type: phonological. Problem: vowel contrast. First repair: minimal pair.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

42. live / leave

Competition type: phonological. Problem: vowel contrast. First repair: reside/be alive vs depart.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

43. rice / lice

Competition type: phonological. Problem: consonant contrast dependent on L1. First repair: food vs insects.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

44. light / right

Competition type: phonological. Problem: liquid contrast for some learners. First repair: illumination vs direction/correctness.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

45. three / tree

Competition type: phonological. Problem: cluster simplification risk. First repair: number vs plant.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

46. world / word

Competition type: phonological. Problem: complex cluster difference. First repair: planet/society vs lexical item.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

47. comfortable / comparable

Competition type: phonological. Problem: shared suffixal pattern. First repair: meaning and stress differences.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

48. criterion / criteria

Competition type: morphological. Problem: singular/plural competition. First repair: number agreement.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

49. phenomenon / phenomena

Competition type: morphological. Problem: irregular number pair. First repair: singular vs plural.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

50. data / datum

Competition type: morphological/register. Problem: modern usage competes with classical number distinction. First repair: follow domain/style.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

51. media / medium

Competition type: morphological/register. Problem: plural/collective variation. First repair: context-specific grammar.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

52. child / children

Competition type: morphological. Problem: irregular plural. First repair: avoid overgeneralised childs.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

53. go / went

Competition type: morphological. Problem: suppletive past. First repair: block goed.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

54. teach / teacher

Competition type: morphological derivation. Problem: verb vs agent noun. First repair: word-class selection.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

55. economic / economics

Competition type: morphological. Problem: adjective vs field noun. First repair: sentence-position contrast.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

56. analyse / analysis

Competition type: morphological. Problem: verb/noun family competition. First repair: grammar frame.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

57. decide / decision

Competition type: morphological. Problem: verb/noun competition. First repair: collocation + syntax.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

58. effective / efficient

Competition type: semantic. Problem: both positive performance adjectives. First repair: outcome achieved vs resource use.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

59. reliable / valid

Competition type: semantic technical. Problem: measurement concepts often confused. First repair: consistency vs measuring intended construct.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

60. cause / correlate

Competition type: semantic scientific. Problem: association vs causation. First repair: evidence threshold.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

61. hypothesis / theory

Competition type: semantic academic. Problem: everyday and scientific meanings compete. First repair: provisional testable explanation vs broader supported framework.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

62. accuracy / precision

Competition type: semantic technical. Problem: close measurement concepts. First repair: closeness to true value vs repeatability/resolution.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

63. risk / hazard

Competition type: semantic technical. Problem: related safety concepts. First repair: possibility/severity vs source of harm.

Speed test: after accuracy is stable, reduce response time gradually. Competition often reappears under pressure before it appears in slow exercises.

Collocation/grammar test: use phrase patterns to bias the correct candidate. Natural partners and constructions can help the intended word win selection.

Neighbourhood test: list nearby words that share form or meaning. Knowing the competitive neighbourhood turns vague confusion into a structured map.

Error-repair test: present a fresh sentence containing the wrong competitor and ask for diagnosis plus correction. Generalised repair shows that the distinction is portable.

Maintenance: revisit high-risk pairs occasionally even after mastery because strongly similar competitors can re-emerge when use becomes infrequent.

24. Second-stage competition protocol

1. economic / economical

Contrastive retrieval: cue one meaning, retrieve the target, then immediately cue the competing meaning and retrieve the neighbour. Alternating retrieval forces the lexicon to preserve the boundary instead of practising one item in isolation.

Rejection practice: show a plausible competitor and require the learner to explain why it is wrong here. Strong lexical selection includes fast rejection of near-misses, not just knowledge of the target.