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