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