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Vocabulary Power — Roots, One-Word Subs & Idioms

📖 Vocabulary  ·  ⏱️ 6 min read  ·  Updated June 2026

Decode any word with roots

You can guess the meaning of an unseen word by breaking it into prefix + root + suffix. Learn ~30 roots and you unlock thousands of words.

Root / PrefixMeaningExamples
bene-goodbenevolent, benefit, benediction
mal-badmalevolent, malice, malnutrition
cred-believecredible, incredible, credentials
chrono-timechronology, chronic, synchronise
omni-allomnipotent, omniscient, omnivore
phil-lovephilosophy, philanthropy, bibliophile
-cidekillinghomicide, suicide, pesticide
-graphywritingbiography, geography, calligraphy
Try it: omni (all) + potent (powerful) = omnipotent = all-powerful. biblio (book) + phile (lover) = a lover of books.

High-frequency one-word substitutions

PhraseOne word
One who loves booksBibliophile
One who knows everythingOmniscient
A person who eats everythingOmnivore
Words used on a tombEpitaph
One who walks in sleepSomnambulist
A government by the peopleDemocracy
One who cannot read or writeIlliterate
A life history written by oneselfAutobiography
Animals that live in water and on landAmphibian
A cure for all diseasesPanacea

How to actually retain vocabulary

  • Learn words in a sentence, never as a bare list — context makes them stick.
  • Group by theme (anger words, praise words) or by root, not alphabetically.
  • Revise the Daily Booster word every morning — 1 word/day = 365 words/year. Open today's word →
  • Use it within 24 hours in your own writing or speech.
💡 For idioms, learn the image behind them — "burn the midnight oil" pictures studying by lamplight late at night = work hard into the night.
📝 Practice this topic — One-Word Substitution (TGT) → 💬 Share

← Back to all study notes  ·  Notes by Dr Pankaj Tiwari, English Lecturer & Author.