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