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