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