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