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