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