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