Here's what rhymes with detectional.
sectional directional correctional bidirectional inflectional inflexional complexional unidirectional convectional Words that almost rhyme with detectional
dimensional intentional detectable attentional detectible terrible exceptional intestinal spectacle genital parable retinal textual dependable seminal detestable impeccable sentinel tenable trigeminal bearable delectable extensional obsessional testable tentacle pentacle perceptional bendable electable medical professional chemical festival marital respectable vegetable plentiful sensual pedestal sceptical illegible ineffable legible unintentional digestible execrable twodimensional undetectable inedible processional correctable repairable wearable breathable perfectible recessional spendable weldable conventional cerebral flexible sensible clerical perceptual amenable credible perceptible skeletal skeptical confessional segmental unbearable untenable defensible polemical chimerical expendable preventable concessional dispensable collectible impressible undependable unexceptional amendable collectable conceptional extendable preventible stretchable connectable spreadable connectible quenchable acceptable accessible numerical congenital incredible susceptible biochemical congressional heterosexual homosexual commendable inflexible insensible lamentable multidimensional receptacle impregnable irrepressible ostensible premarital regrettable alchemical expressible geochemical indigestible intertextual presentable psychosexual threedimensional unprofessional urogenital contestable extensible prophetical suggestible premedical suppressible comestible unwearable hypothetical indispensable inaccessible contemptible unconventional compressible histochemical incontestable indefensible photochemical nonprofessional insusceptible paramedical paraprofessional forgettable subprofessional unpreventable gastrointestinal unacceptable inexpressible reprehensible unforgettable incompressible intracerebral unquenchable anticlerical semiprofessional recommendable nonclerical nonnumerical noncollectable extramarital physicochemical comprehensible alphanumerical musculoskeletal immunohistochemical