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