Here's what rhymes with postinvention.
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lengthen strengthen section session cession hessian seven conception heaven infection perception possession affection perfection accession concession confession inception obsession tendon convection dentin headman felon headmen henchmen heron chevron confection freshen henchman penman pennon vegan hellion direction connection election exception intention profession selection aggression chairman correction injection inspection lesson objection reception succession weapon connexion oppression procession threaten complexion deception dissection erection insurrection lemon lessen recession reckon resection resin secession defection ejection freshman inflection leaden leaven melon abstention dispossession pectin sexton beckon circumvention deaden inflexion lepton bisection destine hempen redden subvention bellman deafen headsman indention refection supervention helpline trisection question collection protection depression impression intervention reflection compression detection eleven rejection brethren intersection intestine progression projection regression resurrection suppression congestion deflection exemption subjection imperfection ingestion intercession misconception transgression dejection digression disaffection disinfection distention inattention pepsin circumspection disconnection indirection interception reflexion abjection concretion penguin preconception reinfection stepson prepossession repossession genuflection kelvin pressman nelson expression suggestion discretion rebellion redemption repression digestion predilection decompression reelection preemption redirection watermelon interjection misdirection selectman gremlin recollection contraception introspection contravention indigestion indiscretion interconnection retrogression retrospection rhododendron nonaggression autosuggestion nonintervention delicatessen