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