-ism — doctrine, belief, practice, condition (affix)

criticism B2

/ˈkɹɪtɪsɪzm̩/ Spoken or written disapproval of someone or something, based on their faults.

capitalism C1

/ˈkæpɪ̈tl̩ˌɪzm̩/ An economic system in which businesses and property are privately owned and run for profit.

optimism B2

/ˈɑptɪmɪzəm/ A tendency to expect the best, or to believe that things will turn out well.

tourism B1

/ˈtɔːɹɪzəm/ The activity of travelling to places for pleasure.

realism C1

/ˈɹi.əlɪzəm/ A practical attitude that accepts the facts of a situation as they really are.

heroism C2+

/ˈhɛroʊˌɪzəm/ great bravery or noble self-sacrifice