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