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