Prefixes and Suffixes: The Building Blocks of English Words
English builds most of its vocabulary from a small set of reusable parts. A root carries the core meaning; a prefix bolts onto the front to change it; a suffix attaches to the back to shift its role. Learn the common affixes and you can decode unfamiliar words on sight — and extend your words for bigger scores in games.
What Prefixes and Suffixes Do
A prefix changes a word’s meaning: happy becomes unhappy, view becomes preview. A suffix usually changes a word’s grammatical role: teach becomes teacher (a person), quick becomes quickly (an adverb). Recognizing the affix lets you isolate the root and understand the whole.
The Prefixes Worth Knowing
RE- — again (redo, rewrite)
PRE-, FORE- — before (preview, foresee)
MIS- — wrongly (misjudge)
SUB-, TRANS-, INTER- — under / across / between (submarine, transport, internet)
The Suffixes Worth Knowing
-ER, -OR, -IST — a person who (teacher, actor, artist)
-TION, -SION, -MENT, -NESS — makes a noun (action, decision, movement, kindness)
-LY — makes an adverb (quickly)
-FUL, -LESS, -ABLE — full of / without / capable of (hopeful, careless, readable)
Why This Helps Your Vocabulary
Meet an unfamiliar word like irreversible and the parts do the work: ir-(not) + reverse + -ible (able to be) — “not able to be reversed.” One known root plus a few affixes can unlock a whole family of words without a dictionary.
Why This Helps in Word Games
Affixes are how you turn a short word into a long, high-scoring one. Spot a chance to add -ING, -ER, or RE- to a word already on the board and you extend it for extra points — sometimes even using all seven tiles for a bonus. Strong players constantly scan their rack for these attachable endings.
Practice Spotting the Parts
Explore how affixes attach with the Words Starting With and Words Ending With tools, and build your word stock with the daily Word of the Day.
Keep building: Words Starting With, Words Ending With, or the Word of the Day.