Here's what rhymes with excession.
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seven heaven lesson lessen resin leaven eleven section exception felon heron extension infection mention tension affection correction invention weapon pension threaten exemption inception lemon reckon freshman ascension headman leaden melon headmen question attention direction collection connection election conception perception selection chairman convention injection inspection perfection reception connexion deception dissection erection insurrection resection tendon convection defection dissension ejection inflection dentin lengthen pepsin henchmen pectin sexton intention reflection detection dimension objection prevention rejection brethren contention intersection intestine resurrection retention strengthen suspension complexion deflection detention subjection imperfection ingestion dejection disaffection distension declension indirection interception reflexion protection intervention suggestion rebellion apprehension hypertension projection recollection redemption congestion digestion misconception condescension disinfection distention inattention pretension reelection abstention disconnection preemption redirection comprehension contraception introspection indigestion interconnection circumspection watermelon predilection contravention misapprehension