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