-ic, -tic pertaining to, having to do with

• ethnic having to do with a people or nation
• cosmetic having to do with beautification

-ac used instead of -ic if an -i immediately precedes

cardiac having to do with the heart

*-ics [Greek, -ika] things having to do with > art, science, study of [usually used with a singular verb]

• acoustics study of sounds/things that are heard (used with a singular verb in the first sense, with a plural verb in the second sense)
• physics study of nature

-ical < -ic + -al (Latin), pertaining to, having the nature of

political pertaining to citizens/having to do with the relationship of citizens to the state [polis]

*-oid resembling, like, shaped

• android {thing that is} man-shaped
• thyroid door (thura) shaped

-ite one connected with, inhabitant of; a commercial product, a mineral

• sybarite an inhabitant of Sybaris > a person devoted to luxurious living; a hedonist
• lucite a clear {transparent} commercial product
• Joesmithite a mineral named after Joe Smith

-ism the belief in, profession or practice of

hylozoism belief in connection of life and matter

-ist one who believes in, professes, or practices, a follower of

dramatist one who makes plays

*-ast one who does or practices, one who believes in

• dicast one who does justice
• ecdysiast stripper
• iconoclast one who breaks images

*-isk, -iscus small

• asterisk a little star
• meniscus a little moon

-ia, -y act, state of [abstract noun forming suffix]

• polity state of being a citizen: relation of citizens to the state
• utopia "no place" (ou "not")

*-sis act, state, condition of

• kenosis condition of being emptied
• thesis act of putting, setting

*-m, -me, -ma [base, -mat-] result of

• theorem result of observing
• theme result of setting
• plasma result of forming
• mathematics "things having to do with the result of learning"