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