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