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