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