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