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