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