Y05W19VC Word Roots — -able / -ible (capable of)

The suffixes -able and -ible come from Latin and carry the core meaning of 'capable of' or 'worthy of'. They attach to verb stems to form adjectives that describe whether something can be done or experienced. Words ending in -able or -ible are common in academic, legal, and formal writing. This module explores six academic words and three further examples that share these suffixes.

Word Families

These three words all use -able / -ible. As you read, notice how the meaning 'capable of' helps explain each word.

readable

/ˈriːdəbəl/

read‑a‑ble

adjective

Something that is readable is clear and easy to read, either because of its content or presentation.

Example: She improved her handwriting so her notes would be readable during the exam.

Synonyms: legible, clear, accessible

Collocations: easy to read, a readable style, highly readable

possible

/ˈpɒsɪbəl/

pos‑si‑ble

adjective

Something that is possible is able to happen, exist, or be done.

Example: With careful planning, it is possible for the whole class to complete the project before the due date.

Synonyms: achievable, feasible, doable

Collocations: make it possible, as soon as possible, it is possible to

flexible

/ˈflɛksɪbəl/

flex‑i‑ble

adjective

Someone or something that is flexible is able to change or adjust easily to new situations.

Example: A flexible timetable allowed students to choose which workshop to attend each afternoon.

Synonyms: adaptable, adjustable, open

Collocations: flexible approach, remain flexible, a flexible plan

Academic Vocab

cause

/kɔːz/

cause

noun

A cause is the reason or event that makes something happen.

Word family: causal (adj.), causation (n.)

Example: The main cause of the flooding was three weeks of unusually heavy rainfall in the catchment area.

Synonyms: reason, origin, source

Collocations: the cause of, a key cause, identify the cause

effect

/ɪˈfɛkt/

ef‑fect

noun

An effect is the result or change that something produces.

Word family: effective (adj.), effectively (adv.)

Example: The effect of the drought on the local farming community was severe and long-lasting.

Synonyms: result, impact, outcome

Collocations: the effect of, have an effect, a significant effect

result

/rɪˈzʌlt/

re‑sult

noun

A result is the outcome of something that has happened, especially of an action or event.

Word family: resultant (adj.)

Example: The result of the experiment showed that the plant grew fastest in indirect sunlight.

Synonyms: outcome, consequence, effect

Collocations: the result of, as a result, a clear result

impact

/ˈɪmpækt/

im‑pact

noun

An impact is the strong effect or influence that something has on another thing.

Word Breakdown: -pact (from Latin pactum meaning ‘to fix’)

Word family: impactful (adj.)

Example: The project had a positive impact on the school's sense of community and belonging.

Synonyms: effect, influence, consequence

Collocations: have an impact, a significant impact, impact on

outcome

/ˈaʊtkʌm/

out‑come

noun

An outcome is the final result or consequence of a process, situation, or action.

Example: The outcome of the mediation session was a fair agreement that both groups could accept.

Synonyms: result, consequence, end result

Collocations: the outcome of, a positive outcome, achieve the outcome

because

/bɪˈkɒz/

be‑cause

conjunction

‘Because’ is used to give the reason for something.

Example: The flooding was so extensive because the river had been running well above its normal level for weeks.

Synonyms: since, as, for the reason that

Collocations: because of, because it, because they

Confusing Words

quiet vs quite

These two words look similar but have different meanings.

  • quiet — Quiet' is an adjective or noun meaning making little or no noise, or a state of calm silence — for example, The class worked in quiet concentration during the reading session.
  • quite — Quite' is an adverb meaning 'fairly', 'rather', or 'completely' — for example, She found the activity quite challenging at first, but improved with practice.

Memory rule: A useful trick: 'quiet' has the word 'quit' in it — you quit making noise. If you mean silence or calm, use 'quiet'. If you mean 'rather' or 'fairly', use 'quite'.