Here's what rhymes with grouu.
                        
                        
                    
                                you  u  lieu  lu  rue  loo  yew  yu  ewe  ru  roux  to  who  do  two  new  through  too  few  true  view  due  knew  blue  drew  du  grew  que  crew  threw  blew  coup  flew  q  qu  shoe  zu  clue  cue  dew  glue  hue  queue  shew  su  sue  tu  vous  chew  cu  deux  flue  fu  slew  zoo  brew  bu  flu  hu  ju  jus  ku  mu  nu  peu  pew  pu  seu  shu  sou  thru  vu  woo  boo  chou  chu  coo  cou  doo  feu  fue  gu  hew  mieux  shou  shrew  thu  tue  vou  vue  wou  wu  clew  goo  mew  moo  pooh  poo  shoo  gnu  slue  thew  whew  phew  review  screw  anew  renew  accrue  stew  adieu  ado  piu  skew  outdo  revue  sprue  tzu  outgrew  redo  strew  halloo  spew  valuer  regrew  achoo  into  pursue  canoe  undue  debut  ensue  taboo  undo  untrue  caribou  tattoo  beaucoup  eschew  sinew  vnto  askew  imbue  endue  foreknew  zebu  indue  kazoo  muumuu  prevue  wazoo  booboo  revenue  overview  residue  withdrew  avenue  bamboo  retinue  subdue  construe  jusqu  overdue  overthrew  kangaroo  shampoo  overdo  ballyhoo  cockatoo  fondue  marabou  bestrew  overflew  overshoe  overdrew  overgrew  atishoo  interview  hitherto  rendezvous  barbecue  honeydew  hullabaloo  barbeque  bugaboo  peekaboo  buckaroo  superglue  misconstrue