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