Here's what rhymes with crackpotism.
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addition edition prison petition rhythm arisen risen audition mizzen given position tradition vision driven listen mission permission admission ambition partition attrition derision fission magician patrician riven stiffen dietitian tactician condition decision division opposition commission competition physician provision acquisition expedition repetition suspicion abolition coalition collision emission exhibition politician prohibition submission forgiven omission tuition apparition erudition sedition apposition dentition imprison logarithm striven cataclysm logician academician ebullition glisten definition composition television transition algorithm precision proposition supervision ammunition cognition deposition exposition incision inhibition intuition nutrition revision superstition clinician excision ignition imposition remission supposition admonition demolition fruition requisition technician volition contrition envision extradition intermission paroxysm rendition obstetrician rhetorician theoretician prevision readmission rescission recognition transmission disposition musician subdivision circumcision juxtaposition mathematician preposition indecision inquisition interposition precondition superposition electrician pediatrician premonition statistician imprecision munition decomposition malnutrition transposition presupposition redefinition disquisition manumission diagnostician predisposition indisposition superimposition wisdom serum theorem dictum gypsum cecum gingham system kingdom victim pilgrim fearsome winsome symptom ecosystem