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