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