Protagonist rhymes with:
antagonist, antagonist, antagonist, organist, abolitionist, accompanist, antagonist, arsonist, botanist, calvinist, chauvinist, communist, conservationist, contortionist, determinist, exhibitionist, expressionist, feminist, illusionist, impressionist, isolationist, jansenist, neoplatonist, obstructionist, organist, perfectionist, platonist, unionist