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