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