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