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