One-Word Substitution
Replace a whole phrase with a single word. Browse by topic, learn the hard families like -cide, -logy and -phobia as patterns, then beat the clock in a timed quiz.
A one-word substitution replaces a whole phrase with a single precise word: “a person who writes books” is an author. Most hard ones are built from roots — -cide means killing, so the murder of a king is regicide; -logy means study, so the study of insects is entomology; -phobia means fear.
| # | Phrase / meaning | One word | Hint or root | Level |
|---|
Keyboard: Space flip · ← → move · K I know it · L still learning
Timed quiz
Pick a question style, a level and a timer. The quiz uses the words left by your filters above.
One-Word Substitution
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One word in place of many
A one-word substitution replaces a whole group of words with a single precise word: “a person who writes books” becomes author. Examiners love them because they test vocabulary and word-building together.
Start with a topic
People, places, groups, sounds, fears — learn one topic at a time, not the whole list.
Learn the roots
Open By root and read each ending once. One rule unlocks fifteen words.
Flip the cards
Say the word before you flip, then mark it known or still learning.
Beat the clock
Switch on the timer — exams give you about 20 seconds per question.
Break the word into pieces
Almost every hard one-word substitution is prefix + root + suffix.
matri (mother) + cide (killing) = matricide
hydro (water) + phobia (fear) = hydrophobia
Learn about twenty roots and you can work out hundreds of words you have never seen.
Pairs students mix up
- Entomology = study of insects · Etymology = study of word origins
- Biannual = twice a year · Biennial = every two years
- Emigrant = goes out of a country · Immigrant = comes into one
- Astronomer = scientist of the stars · Astrologer = foretells the future
- Troop = soldiers or monkeys · Troupe = actors or dancers
How to attack the question
1. Find the key idea in the phrase: “a place where…” → the answer is a place; “one who…” → the answer is a person.
2. Look for the clue word: killing → -cide, study → -logy, fear → -phobia, rule → -cracy or -archy, eating → -vorous.
3. Fix the beginning: who or what is it about? regi- king, patri- father, hydro- water, xeno- stranger.
Spelling earns the mark
The word must be spelt correctly to score. The traps are the double letters and the silent groups: bureaucracy, archaeology, ophthalmologist, claustrophobia, entrepreneur-style endings.
Use “Type the word” in the quiz — it accepts a small slip but always shows you the exact spelling, so write it out three times before the exam.
One-Word Substitution — your questions
What is one-word substitution with examples?
It is a single precise word that replaces a whole descriptive phrase. “A person who writes books” is an author; “one who studies insects” is an entomologist; “a place where bees are kept” is an apiary; “a speech made without preparation” is extempore. Examiners use it because it tests vocabulary and word-building together.
What do the endings -cide, -logy and -phobia mean?
-cide means killing, so homicide is the murder of a human being and regicide the murder of a king. -logy means the study or science of something, so entomology is the study of insects. -phobia means an unusually strong fear, so hydrophobia is the fear of water and claustrophobia the fear of enclosed spaces.
How do I guess a one-word substitution I have never seen?
Break the phrase into pieces. First find the key idea — “a place where…” means the answer is a place, “one who…” means a person. Then find the clue word: killing points to -cide, study to -logy, fear to -phobia, rule to -cracy or -archy, eating to -vorous. Finally fix the beginning: regi- king, patri- father, hydro- water.
What is the difference between entomology and etymology?
Entomology is the study of insects; etymology is the study of the origin and history of words. Other pairs students mix up: biannual means twice a year while biennial means every two years; an emigrant goes out of a country while an immigrant comes into one; an astronomer studies the stars while an astrologer foretells the future.
Do I lose the mark if the spelling is wrong?
Yes — the word has to be spelt correctly to score, and these are exactly the words with traps in them: bureaucracy, archaeology, ophthalmologist, claustrophobia. Use the “Type the word” quiz mode, which accepts a small slip but always shows you the exact spelling, then write the word out three times before the exam.
How many words are listed and how are they organised?
There are 505 one-word substitutions. You can browse them by topic, A to Z, or by level — Level 1 for Class 6 to 7, Level 2 for Class 8 to 9 and Level 3 for Class 10 to 12. The “By root” view groups them into eight families: -cide, -logy, -phobia, -cracy, -archy, -vorous, -graphy and -ism.