Word Roots, Prefixes, and Suffixes

Understanding word roots, prefixes, and suffixes is one of the most powerful vocabulary skills you can develop for the FSCE 11+ exam. When you know these building blocks, you can decode the meaning of thousands of words — even ones you have never seen before.

What Are Word Roots?

A word root is the core part of a word that carries its main meaning. Most English word roots come from Latin or Greek. Think of a root as the trunk of a tree — everything else (prefixes and suffixes) branches off from it.

For example, the root "port" means to carry. Look how many words grow from this one root:

• transport = carry across
• export = carry out
• import = carry in
• portable = able to be carried
• report = carry back (information)

The 50 Most Useful Word Roots

Learning these 50 roots will help you understand hundreds of English words. Study them carefully and look for them in your reading.

Roots from Latin

Root	Meaning	Example Words
port	carry	transport, portable, export
dict	say, speak	dictionary, predict, verdict
rupt	break	interrupt, erupt, corrupt
scrib/script	write	describe, scripture, inscription
ject	throw	inject, reject, project
duct/duc	lead	conduct, produce, educate
fact/fac	make, do	factory, manufacture, facility
vis/vid	see	visible, video, evidence
aud	hear	audience, audio, auditorium
sent/sens	feel	sensation, sensitive, consent
mot/mov	move	motion, remove, promote
vert/vers	turn	convert, reverse, universe
tract	pull, drag	attract, tractor, extract
form	shape	transform, uniform, reform
loc	place	location, local, allocate
temp	time	temporary, tempo, contemporary
voc/vok	call, voice	vocabulary, invoke, vocal
cap/cept	take, seize	capture, accept, concept
mit/mis	send	transmit, mission, missile
cred	believe	credit, incredible, credential
man/manu	hand	manual, manuscript, manufacture
mort	death	mortal, immortal, mortify
aqu	water	aquarium, aquatic, aqueduct
terr	earth, land	terrain, territory, terrace
ann/enn	year	annual, anniversary, perennial

Roots from Greek

Root	Meaning	Example Words
auto	self	automatic, autobiography, autograph
bio	life	biology, biography, antibiotic
graph/gram	write, draw	photograph, diagram, telegram
spec/scop	look, see	spectacle, inspect, microscope
tele	far, distant	telephone, television, telescope
phon	sound	microphone, symphony, phonics
chron	time	chronicle, chronological, synchronise
geo	earth	geography, geology, geometry
path	feeling, suffering	sympathy, empathy, pathetic
log/logy	word, study	biology, dialogue, technology
hydr	water	hydrate, hydrogen, dehydrate
micro	small	microscope, microphone, microbe
mega	large, great	megaphone, megabyte, megalith
poly	many	polygon, polyglot, polysyllabic
mono	one, single	monologue, monopoly, monotone
photo	light	photograph, photosynthesis, photon
therm	heat	thermometer, thermal, thermostat
psych	mind, soul	psychology, psychic, psychiatrist
astr/aster	star	astronomy, asterisk, astronaut
dem	people	democracy, epidemic, demographic
arch	chief, ruler	monarch, anarchy, archbishop
cycl	circle, wheel	bicycle, recycle, cyclone
nym/nom	name	synonym, anonymous, nominate
phil	love	philosophy, philanthropist, bibliophile
morph	form, shape	metamorphosis, morphology, amorphous

Common Prefixes

A prefix is a group of letters added to the beginning of a word to change its meaning. Here are the most important prefixes for the FSCE 11+.

Prefixes That Mean "Not" or "Opposite"

Prefix	Meaning	Examples
un-	not, opposite of	unhappy, undo, unfair
dis-	not, opposite of	disagree, disappear, dislike
mis-	wrongly, badly	misunderstand, misspell, mislead
in-/im-/il-/ir-	not	invisible, impossible, illegal, irregular
non-	not	nonsense, non-fiction, non-stop
anti-	against	antibiotic, antisocial, anticlockwise

Prefixes That Show Position or Direction

Prefix	Meaning	Examples
pre-	before	preview, predict, prehistoric
post-	after	postpone, postscript, post-war
re-	again, back	return, rebuild, rewrite
inter-	between, among	international, interrupt, interact
sub-	under, below	submarine, subway, subtitle
super-	above, beyond	superhero, supernatural, supervise
trans-	across	transport, transfer, translate
over-	too much, above	overcooked, overcome, overlook
under-	too little, below	underpaid, underground, underestimate
ex-	out of, former	exit, export, ex-president

Common Suffixes

A suffix is a group of letters added to the end of a word. Suffixes often change the word class (for example, turning a verb into a noun).

Noun Suffixes (Make a Word into a Noun)

Suffix	Meaning	Examples
-tion/-sion	act of, state of	education, decision, invention
-ment	state of, result of	enjoyment, achievement, movement
-ness	quality of, state of	happiness, kindness, darkness
-er/-or	one who does	teacher, actor, inventor
-ist	one who practises	scientist, pianist, cyclist
-ity	quality of	curiosity, electricity, generosity

Adjective Suffixes (Make a Word into an Adjective)

Suffix	Meaning	Examples
-able/-ible	able to be	comfortable, visible, flexible
-ful	full of	beautiful, hopeful, powerful
-less	without	careless, homeless, endless
-ous/-ious	having the quality of	dangerous, curious, furious
-al	relating to	musical, natural, magical
-ive	tending to	creative, active, expensive

Adverb Suffix

Suffix	Meaning	Examples
-ly	in what manner	quickly, carefully, silently

Root Families: How One Root Creates Many Words

graph TD
    A["Root: SPEC (to look)"] --> B["inspect<br/>look into"]
    A --> C["spectacle<br/>something to look at"]
    A --> D["spectator<br/>one who looks"]
    A --> E["expect<br/>look out for"]
    A --> F["respect<br/>look back at / admire"]
    A --> G["suspect<br/>look under / doubt"]
    A --> H["prospect<br/>look forward"]
    A --> I["perspective<br/>a way of looking"]

How to Decode Unfamiliar Words Using Roots

When you meet an unfamiliar word in the FSCE exam, follow this step-by-step method:

Step 1: Look for a prefix — is there one at the start? Step 2: Look for a suffix — is there one at the end? Step 3: Identify the root — what is left in the middle? Step 4: Combine the meanings to work out the whole word. Step 5: Check your guess against the sentence to see if it makes sense.

Worked Examples

Worked Example 1: "Unbreakable"

Word: unbreakable Step 1 — Prefix: un- = not Step 2 — Suffix: -able = able to be Step 3 — Root: break = to break Answer: "not able to be broken" — something so strong it cannot be broken.

Worked Example 2: "Transportation"

Word: transportation Step 1 — Prefix: trans- = across Step 2 — Suffix: -tion = act of Step 3 — Root: port = to carry Answer: "the act of carrying across" — moving people or things from one place to another.

Worked Example 3: "Incredible"

Word: incredible Step 1 — Prefix: in- = not Step 2 — Suffix: -ible = able to be Step 3 — Root: cred = believe Answer: "not able to be believed" — something so amazing it is hard to believe.

Worked Example 4: "Microscope"

Word: microscope Step 1 — Prefix: micro- = small Step 2 — Suffix: none Step 3 — Root: scope (from scop) = to look Answer: "something for looking at small things" — a device that makes tiny things visible.

Worked Example 5: "Autobiography"

Word: autobiography Step 1 — Prefix: auto- = self Step 2 — Suffix: none Step 3 — Root 1: bio = life, Root 2: graph = write Answer: "self-life-writing" — a book someone writes about their own life.

Worked Example 6: "Predict"

Word: predict Step 1 — Prefix: pre- = before Step 2 — Suffix: none Step 3 — Root: dict = to say Answer: "to say before" — to say what will happen before it happens.

Common Mistakes

Mistake	Why It Is Wrong	Correct Approach
Confusing prefixes un- and in-	Both mean "not" but attach to different words	Learn which words use which: unhappy (not inhappy), invisible (not unvisible)
Forgetting that im-/il-/ir- are forms of in-	im- goes before b, m, p; il- before l; ir- before r	impossible, illegal, irregular — they all mean "not"
Thinking every word starting with "re" has a prefix	Some words just start with "re" naturally	"red" and "real" do not have the prefix re-
Ignoring how suffixes change word class	A suffix can turn a verb into a noun or adjective	"enjoy" (verb) + -ment = "enjoyment" (noun)
Only learning roots, not practising them	Knowing roots is not enough — you must apply them	Always try to decode new words you find in reading

Exam Tips

• Look for roots you know — even in a long, scary-looking word, there is often a familiar root hiding inside.
• Break words into parts — do not try to read the whole word at once. Split it: prefix + root + suffix.
• Use the sentence — after you decode a word from its parts, check your guess fits the sentence.
• Learn roots in families — when you learn one root, learn 5 or 6 words from the same family.
• Make flashcards — put the root on one side and its meaning plus three example words on the other.

Key Vocabulary

Term	Definition
Root	The core part of a word that carries the main meaning
Prefix	Letters added to the beginning of a word to change its meaning
Suffix	Letters added to the end of a word to change its meaning or word class
Etymology	The origin and history of a word
Word family	A group of words that share the same root
Decode	To work out the meaning of an unfamiliar word

Summary

Word roots, prefixes, and suffixes are the building blocks of English vocabulary. Most roots come from Latin or Greek. Prefixes go at the start of a word and change its meaning (like un- meaning "not" or re- meaning "again"). Suffixes go at the end and often change the word class (like -tion turning a verb into a noun). By learning the 50 key roots, the 20 most common prefixes, and the 13 essential suffixes in this lesson, you can decode the meaning of hundreds of unfamiliar words. Always break unfamiliar words into their parts, work out each part's meaning, then check your answer against the context of the sentence.

Worked vocabulary example: decoding 'incomprehensible'

Consider the word incomprehensible, which often appears in 11+ passages. A typical question: "What does incomprehensible mean? Break the word into its parts and explain each."

Step 1 — split into prefix, root, and suffix. The word breaks into four parts: in + com + prehend + ible. Each part carries meaning.

• in- is a prefix meaning "not" (compare with invisible, incorrect, inaccurate).
• com- is a prefix meaning "together" or "with" (compare with combine, compact, compose).
• prehend is a Latin root meaning "to grasp" (compare with apprehend — to catch hold of, comprehend — to grasp mentally).
• -ible is a suffix meaning "able to be" (compare with visible = able to be seen, flexible = able to be flexed).

Step 2 — assemble the meaning. Put the parts together: "not + together + grasp + able to be" = "not able to be grasped together mentally" = "impossible to understand". A direct synonym would be unintelligible or baffling; an antonym would be clear, understandable, or lucid.

Step 3 — test in context. Consider: "The ancient scroll was written in an incomprehensible script." Substituting "impossible to understand" for incomprehensible gives us "written in an impossible-to-understand script" — the sentence still makes sense, which confirms our decoding.

Step 4 — explore the word family. Knowing prehend unlocks a family: apprehend (to catch or understand), comprehend (to understand fully), comprehension (the act of understanding), comprehensive (covering everything), apprehension (worry, because you are trying to "grasp" what might happen), and reprehensible (worthy of being grasped back — deserving criticism).

Step 5 — apply a different prefix to the same root. If we swap in- for mis- (meaning "wrongly"), we get miscomprehend (to understand wrongly). Swap in- for re- (meaning "back" or "again") and we get reprehensible (deserving rebuke). Playing with prefixes like this shows examiners that you can decode words you have never seen before.

Step 6 — spot the suffix trick. The suffix -ible (rather than -able) usually attaches to Latin-derived roots — visible, edible, terrible, horrible. The suffix -able usually attaches to complete English verbs — readable, washable, enjoyable. This is a helpful spelling rule for 11+ candidates.

A typical follow-up question might ask: "Give one synonym and one antonym of incomprehensible." Strong answer: synonym baffling; antonym lucid. Choosing sophisticated synonyms and antonyms (rather than obvious ones like hard and easy) earns higher marks.

Misconception callout

Misconception: "If I learn a long list of roots, I can guess any word's meaning."

Reality: Roots are a powerful starting point, but you must always check the context. English is full of words where the root's ancient meaning has shifted — awful no longer means "full of awe", and silly once meant "blessed". Always decode the parts and read the sentence around the word. Use the root to generate a guess; then use the context to test it.

Attempting different difficulty levels

Root-and-affix questions come in a range of difficulties.

Entry level — identify a single prefix and its meaning.

What does the prefix **un-** mean in the word **unhappy**?
(a) always  (b) not  (c) very  (d) again

Answer: (b) not. Entry-level questions test the most common prefix meanings directly.

Standard level — use a root to decode a medium-difficulty word.

The Latin root **aqua** means "water". Which of these words is related to water?
(a) aquatic  (b) acoustic  (c) acrobat  (d) acquire

Answer: (a) aquatic. Although all four words start with similar letters, only aquatic shares the aqua root. Standard questions test your ability to distinguish between look-alikes and find the real root connection.

Challenge level — assemble meaning from multiple parts of an unusual word.

Using root analysis, what does the word **hydrophobic** mean?
(a) fond of water  (b) afraid of water  (c) underwater  (d) full of water

Answer: (b) afraid of water. Break it down: hydro- (Greek for "water") plus -phobic (from Greek phobos, meaning "fear"). The combination gives "fear of water". Challenge-level questions expect pupils to combine two meaningful roots that they may not have seen paired before. The opposite is hydrophilic (from philos, love) — "water-loving". Pupils who learn -phobic versus -philic can decode dozens of scientific words.

Always warm up with Entry questions, secure Standard marks, then push to Challenge-level decoding with any remaining time.

This content is aligned with typical 11+ / Common Entrance vocabulary and language syllabuses used by UK independent senior schools (ISEB, CEM, GL Assessment, and individual school papers). For the most accurate and up-to-date information, please refer to the specific entrance exam requirements of your target school.

This content is designed for FSCE 11+ preparation.