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