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