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