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An affix is added to the root of a word to change its meaning or its part of speech.

Common noun suffixes -

• -er: teacher, dancer, worker

• -or: translator, investigator

• -ment: engagement, encouragement

• -ness: cleanliness, readiness, willingness

• -tion: invitation, explanation

• -ee: attendee

• -ance: annoyance

Common adjective suffixes -

• -al: punctual, nocturnal, inspirational

• -able: reliable, likable, durable

• -an: Victorian, Mediterranean, magician

• -ary: visionary, dictionary, arbitrary

• -ful: beautiful, restful, harmful

• -ive: attentive, passive, supportive

• -less: careless, meatless, meaningless

• -ant: defiant, abundant, arrogant

Common prefixes -

anti-, mid-, trans-, inter-, extra-, hyper-, auto-, over-

• anti- antibody, antistress, antiestablishment

• mid- midway, midmorning, midwife

• trans- transatlantic, transcontinental, translation

• inter- intercity, interior, interconnected

• extra- extraordinary, extracurricular, extraterrestrial

• hyper- hyperbole, hyperventilate, hyperextend

• auto- automatic, automobile, autopilot

• over- overcompensate, overwhelmed, overbite

Common negative prefixes - dis-, il-, im-, non-, un-, ir-

• dis- dissatisfied, disinterested, distant

• il- illegal, illusion, illustrate

• im- imperfect, immobile, impossible

• non- non-negotiable, non-profit, nonreligious

• un- unbelievable, undesirable, unthinkable

• ir-irreversible, irreverent, irregular