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