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