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