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