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