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