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