Here's what rhymes with rancour.
                        
                        
                    
                                cour  poor  sure  cure  tour  lure  nur  unsure  jure  moor  ture  voor  poore  boor  pure  ensure  honour  assure  mature  insure  manure  allure  amour  mesure  spoor  couture  inure  immure  secure  obscure  endure  armature  impure  reassure  detour  succour  demure  coiffure  tonsure  enamour  premature  procure  immature  brochure  demeanour  paramour  embouchure  epicure  miniature  dishonour  blackamoor  misdemeanour  Words that almost rhyme with rancour
full  pull  wool  bull  lambswool  bucketful  pocketful