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