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