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