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