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