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