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