-s, -es

more than one

i.e.: hotels, amendments, wishes, suffixes

-ed

in the past

i.e.: walked, jumped, helped

-ing

in the present

i.e. walking, jumping, helping

-ate

become

i.e.: complicate, hesitate, eradicate, demonstrate, procastinate

-en

become, to make

i.e.: enlighten, tighten, frighten, brighten, dampen, fasten, loosen, straighten

-ify, -fy

make or become

i.e.: terrify, verify, clarify, dignify, magnify, classify

-ize, -ise

to make; to become

i.e.: hypnotize, fertilize, civilize, rationalize, chastise

-ly

how something is

i.e.: quickly, easily, happily, rectify, magnify

-acy

state or quality

i.e.: privacy, democracy, literacy

-ance, -ence

state or quality of

i.e.: maintenance, preminence, dominance, coincidence, 

cadence

-dom

place or state of being

i.e.: freedom, kingdom, wisdom, boredom, martyrdom

-er, -or, -ist, -ian, -eer

one who; what/that/which

i.e.: teacher, toaster, mentor, survivor, governor, pianist, specialist, magician, engineer

-ism

doctrine, belief

i.e.: communism, socialism, capitalism, realism, feudalism, racism, Catholicism, Buddhism

-ist

one who

i.e.: chemist, socialist, biologist, publicist, realist, romanticist, pragmatist

-ity, -ty

quality of

i.e.: veracity, honesty, clarity, sanity, vanity, rigidity, curiosity

-ment

condition of

i.e.: argument, judgment, apartment, contentment, resentment

-ness

state of being

i.e.: heaviness, happiness, openness, harshness, cleanliness, carelessness

-ion, -sion, -tion

state of being; quality; act

i.e. concession, transition, action, erosion, vision, invitation, conclusion

-ology

study of

i.e.: biology, ecology, sociology, psychology

-age

result of an action

i.e.: marriage, pilgrimage

-hood

condition of being

i.e.: neighborhood, falsehood, childhood

-ary

place for, collection of, one who

i.e.: glossary, library, secretary, dignitary

-ship

art or skill of, condition, rank, capable of

i.e. leadership, citizenship, ownership, companionship, friendship

-able, -ible

able to be, worthy of, capable of

i.e.: comfortable, likable, enjoyable, honorable, terrible, incredible, edible

-ful

notable for, full of

i.e.: fanciful, beautiful, wonderful, colorful, eventful, fearful, hateful, resentful

-ic, -al, -ial, -ical

pertaining to, relating to

i.e.: energetic, historic, caustic, volcanic, regional, fatal, territorial, social, comical

-ious, -ous

characterized by, full of, having

i.e. nutritious, pretentious, curious, prosperous

-ish

having the quality of

i.e.: fiendish, childish, selfish, boyish

-ive

having the nature of, somewhat like

i.e. creative, festive, responsive, positive, negative

-less

without

i.e.: endless, fruitless, worthless, powerless, bottomless, relentless, selfless

-y, -ly

characterized by; act in a way that

i.e.: sleazy, pudgy, funny, risky, curly, manly