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