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