Learn to replace full phrases and definitions with a single precise word. Covers people, places, collective terms, actions, phobias and manias, fields of study, and key word roots (-cide, -ology, -pho...
By the end of this topic, you should be able to:
One word substitution means expressing a whole phrase, clause, or definition in a single word.
"A person who loves books" → Bibliophile "A place where birds are kept" → Aviary "The act of killing oneself" → Suicide
The skill is tested heavily because it measures both vocabulary range and precision. The fastest way to master it is to learn the roots — once you know -cide means killing and -phobia means fear, you can decode dozens of words you've never seen.
| Root | Meaning | Example |
|---|---|---|
| -cide | killing of | homicide (killing of a man) |
| -ology | study of | biology (study of life) |
| -phobia | fear of | acrophobia (fear of heights) |
| -mania | obsession / craving | kleptomania (urge to steal) |
| -ary / -arium | place for | aviary (place for birds) |
| -graphy | writing / recording | cartography (map-making) |
| -phile | lover of | bibliophile (lover of books) |
| miso- | hater of | misanthrope (hater of mankind) |
| Definition | One Word |
|---|---|
| One who hates women | Misogynist |
| One who hates mankind | Misanthrope |
| One who hates marriage | Misogamist |
| One who loves mankind / donates to good causes | Philanthropist |
| A lover of books | Bibliophile |
| An expert judge in matters of taste (art, food) | Connoisseur |
| A person who appreciates fine food | Gourmet |
| One fond of eating to excess (greedy eater) | Gourmand |
| A lover of beauty | Aesthete |
| One who collects coins | Numismatist |
| One who collects stamps | Philatelist |
| One who looks on the bright side | Optimist |
| One who looks on the dark side | Pessimist |
| One who lives for others / selfless | Altruist |
| A self-centred person | Egotist |
| A soldier who fights for money | Mercenary |
| An experienced, long-serving person | Veteran |
| A beginner | Novice / Tyro |
| One who does something for pleasure, not profit | Amateur |
| One who finds fault and sneers at others | Cynic |
| One who steals others' writings as his own | Plagiarist |
| One who can speak many languages | Polyglot |
| One who walks in their sleep | Somnambulist |
| One who talks in their sleep | Somniloquist |
| One who totally abstains from alcohol | Teetotaller |
| An unmarried woman | Spinster |
| An unmarried man | Bachelor |
| One who runs away (e.g. from the law) | Fugitive |
| A student who stays away from school without leave | Truant |
| One who dies for a noble cause | Martyr |
| One who loves and serves their country | Patriot |
| One who attacks established beliefs/traditions | Iconoclast |
| A leader who stirs people through emotion/prejudice | Demagogue |
| A flatterer for personal gain | Sycophant |
| One who compiles dictionaries | Lexicographer |
| One who makes maps | Cartographer |
| One who writes beautifully (handwriting/art) | Calligrapher |
⚠️ Confusable pair: Gourmet = refined appreciator of good food; Gourmand = greedy eater. Tested often.
| Definition | One Word |
|---|---|
| A place where birds are kept | Aviary |
| A place where bees are kept | Apiary |
| A tank/place where fish are kept | Aquarium |
| A place for storing weapons and ammunition | Arsenal / Armoury |
| A place for storing grain | Granary |
| A shed for housing aeroplanes | Hangar |
| A home for orphans | Orphanage |
| A place where coins are made | Mint |
| A place where milk products are made | Dairy |
| A place for the treatment/recovery of the sick | Sanatorium |
| A place where dead bodies are burnt | Crematorium |
| A place where the dead are buried | Cemetery |
| A place where horses are kept | Stable |
| A place where pigs are kept | Sty |
| A place where dogs are kept | Kennel |
| A place for storing water | Reservoir |
| A place where antiques/artefacts are exhibited | Museum |
| A place where films/recordings are made | Studio |
| A place where animals are slaughtered | Abattoir / Slaughterhouse |
| A shelter for the homeless / the insane | Asylum |
| A place where wild animals are kept | Menagerie |
| A large sleeping room with many beds | Dormitory |
| A room for storing food/provisions | Pantry |
| An underground room for storage | Cellar |
| A place where public records are kept | Archive |
| A place for scientific experiments | Laboratory |
| A place for observing stars and planets | Observatory |
| A place where metals are melted and cast | Foundry |
| A place where leather is made / hides are tanned | Tannery |
| A place where beer is brewed | Brewery |
🎯 Exam Tip: The -ary family (aviary, apiary, granary) is a high-frequency MCQ set. Link each to its animal/contents.
| Collection of… | Collective Term |
|---|---|
| Sheep / birds | a flock |
| Cattle / elephants | a herd |
| Bees / locusts | a swarm |
| Wolves / hounds / playing cards | a pack |
| Fish | a school / shoal |
| Lions | a pride |
| Geese (on the ground) | a gaggle |
| Whales / dolphins | a pod |
| Puppies / cubs (young animals from one birth) | a litter |
| Stars (large group) | a galaxy / constellation |
| Grapes / keys / bananas | a bunch |
| Sticks / wood | a bundle |
| Ships | a fleet |
| Flowers (arranged) | a bouquet |
| Dancers / performers | a troupe |
| Soldiers / monkeys | a troop |
| Sailors working a ship | a crew |
| Experts / judges | a panel |
| Company directors | a board |
| Judges hearing a case | a bench |
| Singers | a choir |
| Musicians | a band / orchestra |
| Travellers / camels journeying together | a caravan |
| Ants | a colony |
| Poems (collected in one book) | an anthology |
| Books (a place/collection) | a library |
| Girls / ladies | a bevy |
⚠️ Confusable pair: Troupe = performers/artists; Troop = soldiers (or monkeys). One letter, different meaning.
| Definition | One Word |
|---|---|
| Killing of a man/human | Homicide |
| Killing of oneself | Suicide |
| Killing of an infant | Infanticide |
| Killing of one's own child | Filicide |
| Killing of one's father | Patricide |
| Killing of one's mother | Matricide |
| Killing of one's brother | Fratricide |
| Killing of one's sister | Sororicide |
| Killing of a parent/close relative | Parricide |
| Killing of a king | Regicide |
| Killing of a tyrant | Tyrannicide |
| Killing of a whole race/community | Genocide |
| Killing of a god | Deicide |
| Definition | One Word |
|---|---|
| To put off / delay to a later time | Procrastinate |
| To sleep through the winter | Hibernate |
| To give up the throne/power voluntarily | Abdicate |
| To destroy completely | Annihilate |
| To free someone from blame | Exonerate |
| To free from guilt | Absolve |
| To declare not guilty in court | Acquit |
| To hand over a criminal to another country | Extradite |
| To send someone back to their own country | Repatriate |
| To leave one's own country to settle abroad | Emigrate |
| To come into a foreign country to settle | Immigrate |
| To exclude/banish someone from society | Ostracize |
| To listen secretly to a private conversation | Eavesdrop |
| To use gestures/hand movements while speaking | Gesticulate |
| To overlook or forgive an offence | Condone |
⚠️ Confusable pair: Emigrate = leave (exit) your country; Immigrate = enter a new one. Same move, different viewpoint.
| Fear of… | One Word |
|---|---|
| Heights | Acrophobia |
| Closed / confined spaces | Claustrophobia |
| Open / public spaces | Agoraphobia |
| Water | Hydrophobia |
| Fire | Pyrophobia |
| Strangers / foreigners | Xenophobia |
| Blood | Haemophobia |
| Darkness / night | Nyctophobia |
| Spiders | Arachnophobia |
| Snakes | Ophidiophobia |
| Death / dying | Thanatophobia |
| Light | Photophobia |
| Public speaking | Glossophobia |
| Germs / dirt | Mysophobia |
| Thunder and lightning | Astraphobia |
| The number 13 | Triskaidekaphobia |
| Technology | Technophobia |
| Obsession / craving | One Word |
|---|---|
| Urge to steal | Kleptomania |
| Urge to set things on fire | Pyromania |
| Obsession with power and grandeur | Megalomania |
| Obsession with collecting books | Bibliomania |
| Excessive self-preoccupation | Egomania |
| Obsession with a single idea | Monomania |
| Uncontrollable craving for alcohol | Dipsomania |
| Compulsive lying | Mythomania |
🎯 Exam Tip: Decode any new term by splitting the root: xeno- (stranger) + phobia (fear) = fear of strangers. Klepto- (steal) + mania (urge) = urge to steal.
| Study of… | One Word |
|---|---|
| Mankind / human societies | Anthropology |
| Ancient remains and antiquities | Archaeology |
| Celestial bodies (scientific) | Astronomy |
| The supposed influence of stars on humans | Astrology |
| Living things | Biology |
| Plants | Botany |
| Animals | Zoology |
| The heart | Cardiology |
| The universe as a whole | Cosmology |
| Cells | Cytology |
| The skin | Dermatology |
| Organisms and their environment | Ecology |
| Insects | Entomology |
| The origin and history of words | Etymology |
| The earth's crust and rocks | Geology |
| Family descent / lineage | Genealogy |
| Old age and ageing | Gerontology |
| Blood | Haematology |
| Body tissues | Histology |
| Fish | Ichthyology |
| Weather and the atmosphere | Meteorology |
| Fungi | Mycology |
| The nervous system | Neurology |
| Tumours and cancer | Oncology |
| The eyes | Ophthalmology |
| Birds | Ornithology |
| Diseases | Pathology |
| Drugs and medicines | Pharmacology |
| Languages (historical/comparative) | Philology |
| Bodily functions | Physiology |
| The mind and behaviour | Psychology |
| Earthquakes | Seismology |
| Society | Sociology |
| Religion and God | Theology |
| Poisons | Toxicology |
| Viruses | Virology |
| Study / art of… | One Word |
|---|---|
| Coins and medals | Numismatics |
| Stamp collecting | Philately |
| Beautiful handwriting (the art) | Calligraphy |
| Map-making (the science) | Cartography |
| Handwriting (as a guide to character) | Graphology |
| Measuring time / making timepieces | Horology |
| Clouds | Nephology |
| Birds' eggs | Oology |
| The moon | Selenology |
⚠️ Confusable pair: Astronomy = the science of celestial bodies; Astrology = the belief that stars influence human affairs.
| Definition | One Word |
|---|---|
| That cannot be avoided | Inevitable |
| That cannot be done without / essential | Indispensable |
| That cannot be read | Illegible |
| That cannot be heard | Inaudible |
| That cannot be conquered | Invincible |
| That cannot be seen | Invisible |
| That cannot be corrected/reformed | Incorrigible |
| That cannot be erased/removed | Indelible |
| Definition | One Word |
|---|---|
| Fit to be eaten | Edible |
| Fit to drink | Potable |
| That can be read clearly | Legible |
| That can be touched | Tangible |
| Easily set on fire | Inflammable |
| Definition | One Word |
|---|---|
| Flesh-eating | Carnivorous |
| Plant-eating | Herbivorous |
| Eating both plants and flesh | Omnivorous |
| Able to live both on land and in water | Amphibian |
| Definition | One Word |
|---|---|
| A life story written by oneself | Autobiography |
| A life story written by someone else | Biography |
| A handwritten document | Manuscript |
| Words inscribed on a tombstone | Epitaph |
| The concluding part of a literary work | Epilogue |
| The introductory part of a literary work | Prologue |
| Happening/published after one's death | Posthumous |
| Examination of a body after death | Postmortem |
| Of unknown name or authorship | Anonymous |
| A false/fictitious name used by an author | Pseudonym |
| Holding a position without payment | Honorary |
| Definition | One Word |
|---|---|
| Belonging to the same period/time | Contemporary |
| An imaginary perfect place/society | Utopia |
| A cure for all diseases or problems | Panacea |
| Lasting a very short time | Ephemeral |
| Lasting throughout the year / long-lasting | Perennial |
| A sentimental longing for the past | Nostalgia |
| Inability to sleep | Insomnia |
| Loss of memory | Amnesia |
| Word for word (exact reproduction) | Verbatim |
| A detailed plan or route of a journey | Itinerary |
⚠️ Confusable pair: Autobiography = written by oneself; Biography = written by another person.
| Root / Ending | Meaning | Quick Examples |
|---|---|---|
| -cide | killing of | homicide, suicide, regicide |
| -ology | study of | biology, geology, psychology |
| -phobia | fear of | acrophobia, xenophobia, hydrophobia |
| -mania | obsession/craving | kleptomania, pyromania, megalomania |
| -ary / -arium | place for | aviary, apiary, aquarium |
| -graphy | writing/recording | calligraphy, cartography |
| -phile | lover of | bibliophile, aesthete |
| miso- | hater of | misogynist, misanthrope, misogamist |
| in-/il-/im- (+ -ible) | cannot be… | inevitable, illegible, invincible |
| -vorous | eating | carnivorous, herbivorous, omnivorous |
| Word A | Word B | Difference |
|---|---|---|
| Gourmet | Gourmand | refined taste vs greedy eater |
| Emigrate | Immigrate | leave a country vs enter a country |
| Astronomy | Astrology | science of stars vs stars' "influence" |
| Troupe | Troop | performers vs soldiers |
| Autobiography | Biography | written by self vs by another |
| Misogynist | Misogamist | hates women vs hates marriage |
| Edible | Potable | fit to eat vs fit to drink |