Here's what rhymes with supplementive.
plaintive Words that almost rhyme with supplementive
arranges granges interchanges native dative copulative nonnative creative authoritative innovative invasive pervasive appreciative imitative iterative oxidative vegetative abrasive educative evasive radiative dissipative evaporative emulative annotative cooperative legislative qualitative persuasive associative evaluative deliberative manipulative meditative regulative rehabilitative connotative denotative procreative stimulative cogitative dissuasive collaborative integrative interpretative dissociative accumulative unappreciative unpersuasive administrative quantitative investigative noninvasive nonabrasive nonadministrative