Here's what rhymes with gruff.
                        
                        
                    
                                rough  ruff  luff  tough  bluff  buff  cuff  puff  slough  fluff  huff  muff  duff  scruff  guff  enough  stuff  snuff  rebuff  scuff  Words that almost rhyme with gruff
of  us  love  rush  crush  glove  lush  luv  does  thus  plus  bus  brush  dove  flush  pus  blush  fuss  hush  truss  buzz  plush  shove  thrush  gush  mus  mush  muss  slush  breve  cuss  fuzz  nus  above  thereof  whereof  hereof  schemas  twas  beauteous  fewness  discuss  hairbrush  underbrush  minibus  superfluous  mellifluous  gulf  engulf