Here's what rhymes with illustative.
dative native imitative iterative creative legislative authoritative innovative associative oxidative vegetative educative radiative dissipative evaporative nonnative annotative cooperative qualitative collaborative appreciative integrative deliberative meditative dissociative connotative denotative cogitative emulative administrative evaluative investigative regulative procreative copulative stimulative quantitative interpretative manipulative rehabilitative unappreciative accumulative nonadministrative Words that almost rhyme with illustative
cages sages rages phages wadis wadges mutatis engages bellyaches reengages disengages greengages macrophages plaintive persuasive pervasive abrasive evasive invasive dissuasive unpersuasive nonabrasive noninvasive