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