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