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