Agonist rhymes with:
abortionist, africanist, anticommunist, collaborationist, colonist, constitutionist, constructionist, expansionist, extortionist, humanist, interventionist, nutritionist, percussionist, peronist, preservationist, protectionist, receptionist, rejectionist, religionist, reservationist, revisionist, revolutionist, satanist, secessionist, segregationist, zionist