Colonist rhymes with:
abortionist, africanist, agonist, anticommunist, collaborationist, constitutionist, constructionist, expansionist, extortionist, humanist, interventionist, nutritionist, percussionist, peronist, preservationist, protectionist, receptionist, rejectionist, religionist, reservationist, revisionist, revolutionist, satanist, secessionist, segregationist, zionist
Colonist sounds like:
calmest, challenged, cleanest, cleansed, clenched, climaxed, clinched, collingwood, colonized, columnist