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