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