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