About One Word Substitutes
A one word substitute question describes something in a phrase and asks for the single word that names it. The answer is a matter of vocabulary rather than of reasoning, so the work is to recognise the description and to have the word ready.
What you need to understand
- The words fall into families, and knowing the family gives the answer even when the exact word is half-remembered.
- Many are built from a Greek or Latin root: bio means life, geo means earth, phone means sound, and logos means word or study.
- A person who studies something usually ends in -ist or -logist: botanist for plants, geologist for rocks, etymologist for the origin of words.
- An abnormal fear ends in -phobia, and the word in front names what is feared: hydrophobia for water, acrophobia for heights.
- A place where something is kept often ends in -ary or -arium: apiary for bees, aviary for birds, aquarium for fish.
- A system of government ends in -cracy: democracy by the people, autocracy by one person, bureaucracy by officials.
- Words beginning with omni mean all: omnipresent everywhere, omniscient knowing everything, omnipotent all powerful.
- The words ending in -vorous describe what an animal eats: herbivorous for plants, omnivorous for plants and flesh.
How to work through these questions
- Read the description and decide which family it belongs to: a person, a place, a fear, a system, or a kind of animal.
- Pick out the key word in the description. A person who studies insects gives insects, and the word for studying insects follows from it.
- Recall the ending for that family before the whole word: -ist for a person who studies, -phobia for a fear, -cracy for a system.
- Use the root to build the beginning: entom- for insects gives entomologist.
- Check the options against the family. A noun ending in -logy is the study rather than the person who does it, and that distinction decides several questions of this kind.
- Rule out the options that belong to another family altogether, which usually leaves one.
- Confirm the answer by reading the description back with the word in it.
Mistakes that cost marks
- Choosing the name of the study instead of the person who carries it out: botany is the subject, a botanist is the person.
- Confusing two words that share a root, such as misogynist, which is a hater of women, and misanthrope, which is a hater of mankind.
- Mixing up the endings for a fear and for a place where something is kept, which sound similar but mean different things.
- Choosing a word that fits the general subject without matching the detail, as choosing botanist for a question about animals.
- Answering with a phrase rather than one word. The question asks for a single word, and a phrase is wrong however accurate.
- Overlooking a word that is close in spelling but different in meaning, such as bibliophile, a lover of books, and bibliographer.
Worked example
Which one word means: a person who studies the stars and planets?
- The description names a person, so the answer is a person word rather than the name of a subject.
- The key word is stars and planets, which is what astronomy is about.
- The root for stars is astro, as in astrology and astronaut.
- The ending for a person who studies something is -er or -ist, giving astronomer.
- A word ending in -onomy or -ology would name the subject instead of the person, so those options can be set aside.
- Astronomer is the only option that names a person who studies the stars.
Answer: astronomer
Practice questions with answers
A few One Word Substitutes questions with the full solution shown, so you can see
how the method is applied before you attempt the timed set.
Question 1
Which of these words means: a person who studies rocks?
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A
pessimist
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B
epitaph
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C
geologist
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D
scapegoat
Answer: Option C — with explanation
The single word for a person who studies rocks is 'geologist'.\nThe other options are words for other things, so none of them fits this definition.
Common mistakes
- a word of the same kind, but the word for something else: epitaph
- a word of the same kind, but the word for something else: pessimist
- a word of the same kind, but the word for something else: scapegoat
Question 2
Which of these words means: a person against whom a lawsuit is brought?
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A
apiary
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B
pedestrian
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C
defendant
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D
bureaucracy
Answer: Option C — with explanation
The single word for a person against whom a lawsuit is brought is 'defendant'.\nThe other options are words for other things, so none of them fits this definition.
Common mistakes
- a word of the same kind, but the word for something else: pedestrian
- a word of the same kind, but the word for something else: bureaucracy
- a word of the same kind, but the word for something else: apiary
Question 3
Which one word means: a person who expects the worst outcome?
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A
hangar
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B
biography
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C
pessimist
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D
cardiologist
Answer: Option C — with explanation
The single word for a person who expects the worst outcome is 'pessimist'.\nThe other options are words for other things, so none of them fits this definition.
Common mistakes
- a word of the same kind, but the word for something else: cardiologist
- a word of the same kind, but the word for something else: biography
- a word of the same kind, but the word for something else: hangar
Question 4
Which one word means: a person who studies the stars and planets?
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A
democracy
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B
astronomer
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C
meteorologist
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D
cobbler
Answer: Option B — with explanation
The single word for a person who studies the stars and planets is 'astronomer'.\nThe other options are words for other things, so none of them fits this definition.
Common mistakes
- a word of the same kind, but the word for something else: cobbler
- a word of the same kind, but the word for something else: meteorologist
- a word of the same kind, but the word for something else: democracy
Question 5
Which one word means: a person who sells flowers?
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A
florist
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B
stoic
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C
autocracy
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D
sculptor
Answer: Option A — with explanation
The single word for a person who sells flowers is 'florist'.\nThe other options are words for other things, so none of them fits this definition.
Common mistakes
- a word of the same kind, but the word for something else: sculptor
- a word of the same kind, but the word for something else: stoic
- a word of the same kind, but the word for something else: autocracy
Frequently asked questions
Should I learn these words as a list?
Learn them in families instead. The endings, -ist, -phobia, -cracy, -ary and -vorous, carry the meaning of the word, and a family is easier to remember than a list a hundred long.
What is the difference between botany and a botanist?
Botany is the study of plants and a botanist is the person who studies them. Questions of this kind often offer both, so read the description to see whether a person or a subject is being asked for.
How do I tell misogynist from misanthrope?
The second half names what is hated. Gyn means woman and anthropos means mankind, so a misogynist hates women and a misanthrope hates people in general.
Is a phrase ever acceptable as the answer?
No. The question asks for one word, and that is the point of it. A phrase that describes the same thing is still the wrong kind of answer.
How can I work out a word I have never seen?
Break it into its root and its ending. The ending tells you the family and the root tells you the subject, which together are usually enough to pick the answer out of the options.
