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