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