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