Chapter 7 · English Grammar

One-Word Substitution & Confusable Words

Advanced ⏱ 40–50 minutes 🎓 Competitive & Beyond

What you will be able to do

  • Replace a phrase with one precise word
  • Recall high-frequency one-word substitutions
  • Distinguish commonly confused word pairs
  • Use affect/effect, principle/principal etc. correctly
  • Build a high-yield exam vocabulary
Builds on / Related chapters
Grade 10 · Vocabulary: Collocations & Word Families Grade 6 · Vocabulary & Usage

1 Quick Introduction

English

Two vocabulary topics appear in nearly every competitive paper. One-word substitution asks for a single precise word in place of a phrase ('one who walks in sleep' = somnambulist). Confusable words test pairs that look or sound alike but differ in meaning (affect vs effect). Both reward focused memorisation — and this chapter gives you the high-yield lists.

हिन्दी

लगभग हर प्रतियोगी पेपर में दो शब्दावली-विषय आते हैं। One-word substitution किसी वाक्यांश के स्थान पर एक सटीक शब्द माँगता है ('one who walks in sleep' = somnambulist)। Confusable words ऐसे युग्म जाँचते हैं जो दिखने/सुनने में समान पर अर्थ में भिन्न हों (affect बनाम effect)। दोनों केंद्रित स्मरण को पुरस्कृत करते हैं — और यह अध्याय आपको high-yield सूचियाँ देता है।

2 A Real-Life Situation

Imagine this

A classic exam pair:

Q: The new rule will ___ everyone. / The new rule had a positive ___.
(affect / effect)

A: 'affect' (verb) in the first; 'effect' (noun) in the second.

Why this form? 'affect' is the verb (to influence) and 'effect' the noun (a result). Confusing them is the single most common vocabulary error — and exam-setters love to test it. Knowing the rule wins the mark every time.

3 The Grammar Rule

Rule & Formula
PhraseOne word
one who walks in sleepsomnambulist
one who collects stampsphilatelist
fear of waterhydrophobia
government by the peopledemocracy
killing of a kingregicide
Learn the precise word + keep confusable pairs straight
'a place for keeping money' = a bank (or treasury).

4 One-Word Substitution

Replace a descriptive phrase with one exact word. Learn these high-frequency items:

PhraseOne Word
one who cannot read or writeilliterate
one who studies birdsornithologist
study of the starsastronomy
one who eats everythingomnivore
unable to pay debtsinsolvent / bankrupt
one who loves mankindphilanthropist
a person who walks on footpedestrian
words inscribed on a tombepitaph
one who speaks many languagespolyglot
a medicine that kills germsantiseptic

Many derive from Greek/Latin roots (somn = sleep, hydro = water, -cide = killing, -logy = study), so decoding the roots often reveals the answer.

Visual — One-Word Substitution
one who walks in sleep→somnambulist
1
Worked Example
One word: a person who collects coins
Solution

numismatist.

2
Worked Example
One word: the murder of one's brother
Solution

fratricide (-cide = killing; frater = brother).

Key Points

  • Replace a phrase with one precise word
  • Many derive from Greek/Latin roots (somn, hydro, -cide, -logy)
  • Decode the roots to work out unfamiliar answers

5 Confusable Word Pairs

These pairs are tested constantly — learn the distinction:

PairDistinction
affect / effectverb (to influence) / noun (a result)
accept / exceptto receive / to exclude
advice / advisenoun / verb
principle / principala rule / chief or head of a school
stationary / stationerynot moving / writing materials
complement / complimentcompletes / praises
continual / continuousrepeated / unbroken
imply / inferthe speaker implies / the listener infers
lay / lietransitive (lay it down) / intransitive (lie down)
disinterested / uninterestedimpartial / not interested

Tip: link each word to a memory hook — 'principAL is my pAL (the head)'; 'stationERy has an E for Envelope'.

1
Worked Example
Choose: Her ___ improved the room. (complement / compliment)
Solution

compliment — if it means praise; complement if it means it completed/matched the room. (Context decides.)

2
Worked Example
Choose: He gave me good ___. (advice / advise)
Solution

advice — the noun.

Key Points

  • affect = verb, effect = noun; accept = receive, except = exclude
  • advice = noun, advise = verb; principle = rule, principal = head
  • Use memory hooks to keep pairs straight

6 Vocabulary Builder

WordMeaningहिन्दी
Somnambulista sleepwalkerनींद में चलने वाला
Philatelista stamp collectorडाक-टिकट संग्राहक
Insolventunable to pay debtsदिवालिया
Polyglotspeaker of many languagesबहुभाषी
Epitaphwords on a tombसमाधि-लेख
✎ Vocabulary Quick Test0 / 1
Q.'One who studies birds' is a/an:
Explanation: An ornithologist studies birds.

7 Common Mistakes to Avoid

✗ IncorrectThe rule will effect everyone.
✓ CorrectThe rule will affect everyone.
'affect' is the verb (to influence).
✗ IncorrectHe gave me good advise.
✓ CorrectHe gave me good advice.
'advice' is the noun.
✗ IncorrectThe principle of the school spoke.
✓ CorrectThe principal of the school spoke.
'principal' = head; 'principle' = rule.
✗ IncorrectI bought stationary for the office.
✓ CorrectI bought stationery for the office.
'stationery' = writing materials.

8 Practice Exercises

Fill in the BlanksLevel 1
Give the one-word substitution.
  1. one who cannot read or write
  2. fear of water
  3. government by the people
  4. killing of a king
  5. one who loves mankind
Answer Key
  1. illiterate
  2. hydrophobia
  3. democracy
  4. regicide
  5. philanthropist
Fill in the BlanksLevel 2
Choose the correct confusable word.
  1. The medicine had a quick ______. (affect/effect)
  2. Please ______ my apology. (accept/except)
  3. Honesty is a moral ______. (principle/principal)
  4. The car remained ______ at the signal. (stationary/stationery)
  5. A good judge is ______. (disinterested/uninterested)
Answer Key
  1. effect
  2. accept
  3. principle
  4. stationary
  5. disinterested
Error Detection
  1. The new policy will effect prices.
  2. He gave me a good advise.
  3. She is the principle of our college.
  4. The shop sells stationary.
Answer Key
  1. The new policy will affect prices. (error: effect)
  2. He gave me good advice. (error: advise)
  3. She is the principal of our college. (error: principle)
  4. The shop sells stationery. (error: stationary)
Sentence Correction
  1. Everyone came except him, accept Sam.
  2. Her speech complimented the theme perfectly.
  3. The author infers that the plan failed. (speaker)
Answer Key
  1. Everyone came except him, including Sam. (or: everyone accepted Sam)
  2. Her speech complemented the theme perfectly. (completed it)
  3. The author implies that the plan failed.
Rearrange the Words
  1. who / one / in / walks / sleep / = / somnambulist
  2. the / will / rule / affect / everyone
  3. moral / a / honesty / principle / is
Answer Key
  1. one who walks in sleep = somnambulist
  2. The rule will affect everyone.
  3. Honesty is a moral principle.
Match the Following
Column AColumn B
1. affecta. impartial
2. principalb. verb (influence)
3. stationeryc. writing materials
4. disinterestedd. head of a school
Answer Key
affect → verb (influence)principal → head of a schoolstationery → writing materialsdisinterested → impartial

9 Micro Quiz

✎ Quick Check — 5 questions0 / 5
Q1.'One who collects stamps':
Explanation: A philatelist.
Q2.'The rule will ___ sales.'
Explanation: Verb → 'affect'.
Q3.'principal' means:
Explanation: Head/chief (or capital sum).
Q4.'stationery' means:
Explanation: Writing materials.
Q5.'fear of water':
Explanation: Hydrophobia.

10 Reading Practice

The principal, a disinterested judge of talent, complimented the young polyglot on her speech. "Your words will surely affect the audience," she said, "and the effect will last." The girl, once an illiterate orphan, had become a philanthropist who advised others to never stop learning. Her story, she insisted, was based on a single principle: perseverance.

Comprehension Questions
  1. Identify the one-word substitutions in the passage.
  2. Find a correctly used confusable pair.
  3. What does 'disinterested' mean here?
Answer Key
  1. polyglot (speaker of many languages), illiterate (unable to read/write), philanthropist (lover of mankind).
  2. 'affect' (verb) and 'effect' (noun); also 'principal' (head) vs 'principle' (rule); 'complimented' (praised); 'disinterested' (impartial).
  3. Impartial / unbiased — not 'uninterested'.

11 Speaking, Writing & Daily Use

Say these aloud
  • She is an ornithologist who studies eagles.
  • The new rule will affect everyone.
  • The effect was immediate.
  • He is the principal of our school.
  • A judge must be disinterested.
Write five sentences, each using one one-word substitution and correctly using one confusable word (affect/effect, principle/principal, etc.).
Example: The philanthropist gave generously. The principal praised her. The gift had a great effect.

12 Challenge Zone

🔥 Higher-Level Questions — 30 / 3
Q1.'One who is present everywhere':
Explanation: Omnipresent = present everywhere.
Q2.Choose: 'The two designs ___ each other beautifully.'
Explanation: 'complement' = complete/match.
Q3.'continual' vs 'continuous': 'The ___ noise of the engine never stopped.'
Explanation: 'continuous' = unbroken (never stopped).

13 Chapter Mind Map

Mind Map
  ONE-WORD & CONFUSABLES
                |
   +------------+------------+
   |                         |
 ONE-WORD               CONFUSABLES
 SUBSTITUTION           affect/effect
 phrase > 1 word        principle/principal
 somnambulist           stationary/stationery
 philatelist            disinterested/un-
 roots: somn/hydro/-cide imply/infer, lay/lie

14 One-Minute Revision

Remember these

  • One-word substitution: replace a phrase with one precise word
  • Many derive from Greek/Latin roots (somn=sleep, hydro=water, -cide=killing)
  • affect = verb, effect = noun; advice = noun, advise = verb
  • principle = rule, principal = head; stationary = still, stationery = writing materials
  • disinterested = impartial; uninterested = not interested