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