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