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