Here's what rhymes with hexafunctional.
functional junctional nonfunctional dysfunctional Words that almost rhyme with hexafunctional
subtotal multiple instructional adjustable culpable lovable constructional gullible loveable touchable deductible untouchable ineluctable refundable unlovable clubbable uncrushable conductible combustible inculpable nonrefundable incombustible noncombustible