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