Here's what rhymes with imperfectionism.
perfectionism exorcism sophism mechanism prism pessimism schism protectionism animism chauvinism euphemism hedonism holism shamanism interventionism isomerism sectionalism chrism organism communism socialism feminism heroism optimism symbolism cynicism dualism dynamism federalism humanism modernism anachronism catechism egoism egotism fatalism nihilism paganism secularism separatism anarchism aphorism astigmatism factionalism heathenism hypnotism mannerism revisionism stoicism abolitionism albinism archaism ecumenism impressionism racialism synergism creationism galvanism philistinism solecism specialism tokenism tropism nationalism antagonism despotism journalism liberalism terrorism activism embolism fanaticism feudalism formalism magnetism professionalism rationalism rheumatism scepticism unionism classicism consumerism dogmatism eroticism pacifism aneurism centralism commercialism elitism favoritism fetishism functionalism isolationism legalism nepotism ostracism pauperism provincialism sectarianism voluntarism automatism cretinism exhibitionism exoticism favouritism mesmerism parochialism solipsism agrarianism futurism hooliganism mongolism purism criticism capitalism imperialism alcoholism conservatism individualism materialism mysticism pluralism skepticism altruism barbarism determinism empiricism naturalism positivism pragmatism absolutism bilingualism cannibalism collectivism evangelism industrialism internationalism militarism narcissism paternalism postmodernism regionalism behaviorism corporatism eclecticism emotionalism expansionism lyricism parasitism plagiarism populism recidivism sensationalism sentimentalism traditionalism botulism expressionism negativism neutralism puritanism revivalism syndicalism witticism metabolism patriotism colonialism parallelism radicalism relativism authoritarianism fundamentalism agnosticism intellectualism mercantilism monasticism scholasticism anticommunism clericalism gradualism proselytism romanticism hyperthyroidism hypothyroidism republicanism totalitarianism utilitarianism antisemitism egalitarianism existentialism microorganism cosmopolitanism humanitarianism evangelicalism somnambulism constitutionalism environmentalism electromagnetism transcendentalism Words that almost rhyme with imperfectionism
mizzen mission rhythm arisen risen given addition vision commission edition listen permission physician prison admission ambition emission exhibition submission forgiven omission fission audition riven position condition definition driven expedition petition suspicion coalition cognition collision exposition incision inhibition clinician ignition remission attrition derision fruition magician sedition volition envision imprison intermission striven stiffen glisten decision division opposition tradition provision recognition transition acquisition algorithm supervision abolition ammunition intuition nutrition partition revision excision imposition musician supposition tuition admonition apparition circumcision erudition requisition technician apposition contrition dentition extradition inquisition logarithm patrician rendition cataclysm logician theoretician academician dietitian ebullition munition readmission rescission tactician competition composition television transmission disposition precision repetition deposition politician prohibition superstition subdivision demolition mathematician indecision paroxysm redefinition manumission premonition rhetorician imprecision prevision proposition preposition indisposition interposition precondition superposition disquisition electrician obstetrician statistician decomposition juxtaposition malnutrition predisposition transposition presupposition pediatrician superimposition diagnostician wisdom serum theorem cecum gingham system kingdom victim dictum gypsum fearsome winsome symptom pilgrim ecosystem