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