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