Parts of a word: root, stem, affix and word family
Many words can be cut into smaller meaning parts called morphemes.
- Root (base): the core meaning, such as play, kind.
- Affix: a part added to a root. A prefix goes before (un-, re-, dis-); a suffix goes after (-ness, -er, -ful). In some languages the affix is called a formant.
- Stem: the root plus any affixes before the final ending. A stem can be underived (a simple root: play) or derived (made from another word: player).
- Word family: all words made from the same root: play, player, replay, playful, playable.
Words in a family share meaning, so knowing one root helps you guess many words.
Derivation: prefixes and suffixes
Derivation makes a new word by adding an affix. This is morphological formation, because the form of the word changes.
- Prefix, meaning changes: un- (not): unkind; re- (again): replay; dis- (opposite): disagree.
- Suffix, word class often changes: kind (adjective) β kindness (noun); play (verb) β player (noun), playful (adjective).
Watch the spelling: happy + ness = happiness (y becomes i); use + able = usable (the silent e is dropped). Not every combination exists: "unplay" is not a word. Use a dictionary to check.
Compound words
A compound joins two (or more) whole words into one new word with its own meaning: sun + flower = sunflower, note + book = notebook, tooth + brush. Compounds may be written joined (sunflower), hyphenated (mother-in-law) or as two words (ice cream). The meaning is often not a simple sum: a blackboard can be green.
Compare: derivation adds a small affix that cannot stand alone; compounding joins two words that can each stand alone.
Other ways to make words: conversion, clipping, blending, acronyms
- Conversion (an internal way): a word changes class without any change in form. Water (noun) β "water the plants" (verb); email β "to email".
- Clipping: shortening: telephone β phone.
- Blending: parts of two words: smoke + fog = smog, breakfast + lunch = brunch.
- Acronym: first letters: laser, PIN.
Loanwords and etymology
A language can also take a word from another language: a loanword (an external way of enriching vocabulary). English took jungle, bungalow, pyjamas and shampoo from Hindi and Urdu, emoji from Japanese and pizza from Italian. Hindi uses school, train from English and kursi, bazaar from Arabic and Persian. The word is usually adjusted to fit the new language's sounds and spelling.
Etymology is the study of where words come from and how their forms and meanings changed. A good dictionary shows it, often in brackets.
Names of inhabitants, possessive adjectives and diminutives
- Names of inhabitants are derived from place names with a suffix: India β Indian, Delhi β Delhiite, Italy β Italian. Slavic languages use suffixes too (Polish -anin, Ukrainian -Π΅ΡΡ).
- Possessive adjectives can be derived from names in some languages, for example Ukrainian and Polish forms like Π±Π°ΡΡΠΊΡΠ² (father's). In English we use 's or words like my.
- Diminutives make a word small or friendly: dog β doggie, book β booklet. Used for warmth in speech and stories; in formal writing they sound childish or can sound ironic.
Speech versus spelling: sound changes and stress
When parts join, sounds can change. This is assimilation: a sound becomes more like its neighbour. in + possible is spelled impossible (n becomes m before p). In Polish and many languages, a voiced sound at the end of a word or before a voiceless one is pronounced voiceless, but the spelling keeps the original letter. So the way we say a word can differ from how we write it.
Stress (the louder syllable) may also change with word building: English photograph β photography. In Polish the stress usually falls on the second-last syllable (ksiΔ ΕΌ-ka), with a few exceptions, such as words from Latin and Greek like ma-te-MA-ty-ka, stressed on the third-last syllable. Learn the rule, then the exceptions.
Try it
In the 3D word builder, make as many real words as you can from "play" and "use". At home: pick the root "act" and write all words you know (action, actor, react, active, inactive). Circle the prefixes in blue and the suffixes in green. Then think of three compound words in your own language.
Key formulas and definitions
- Derivation: prefix + root + suffix (un + kind + ness = unkindness)
- Compound: word + word (sun + flower = sunflower)
- Conversion: same form, new word class (water noun β water verb)
- Blend: part + part (smoke + fog = smog)
- Word family: all words from one root
Worked examples
1. Break "unhappiness" into parts and name each part.
un- (prefix) + happy (root) + -ness (suffix). The y turns into i when -ness is added.
2. Is "playground" derived or compound? Why?
Compound. It joins two whole words that can stand alone: play + ground.
3. Name the process in "to text a friend" and "a text message".
Conversion: the noun text is used as a verb without any change of form.
Common mistakes
- Mixing up prefix and suffix. Prefix = before the root (pre- means before). Suffix = after.
- Calling every long word a compound. Compound = two whole words. "Kindness" is derived (root + suffix).
- Forgetting spelling changes: happy + ness = happiness, not happyness.
- Thinking any prefix fits any root. "unplay" does not exist; check a dictionary.