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