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