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