Here's what rhymes with oncedominant.
                        
                        
                    
                                dominant  prominent  predominant  Words that almost rhyme with oncedominant
commonest  nominate  botanist  continent  communist  consonant  apportionment  apologist  somnolent  rottenest  uncommonest  confident  fortunate  concomitant  fraudulent  novelist  anthropologist  populist  biologist  cognizant  columnist  geologist  protestant  formalist  gemologist  unfortunate  consequent  coordinate  incompetent  proportionate  psychologist  bicarbonate  consulate  monopolist  pathologist  corpulent  incontinent  reapportionment  zoologist  ideologist  urologist  anthologist  congregant  contortionist  ethologist  escapologist  approximate  consummate  proximate  antioxidant  neurologist  entomologist  extortionate  gynaecologist  phrenologist  seismologist  graphologist  futurologist  gemmologist  gynecologist  musicologist  embryologist  cosmologist  violoncellist  anesthesiologist  anaesthesiologist  bacteriologist  endocrinologist  parapsychologist