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