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