Here's what rhymes with immaturer.
                        
                        
                    
                                gooier  maturer  demurer  Words that almost rhyme with immaturer
purer  looker  sugar  poorer  fuller  butcher  juror  surer  cooker  footer  hooker  puller  pusher  curer  woofer  fuhrer  goober  hoofer  moocher  impurer  pulsar  usurer  obscurer  snooker  woodsier  insurer  procurer  securer  crookeder  ensurer  censurer