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