Here's what rhymes with underlay.
                        
                        
                    
                                re  lay  ray  ballet  yea  allay  ley  rei  lei  rea  roue  they  may  day  way  away  say  pay  play  today  delay  j  array  bay  clay  decay  gay  gray  grey  k  pray  che  hay  nay  prey  weigh  tray  fay  fe  fray  slay  underway  valet  dey  fillet  hey  passe  sei  sleigh  whey  drei  jay  kc  payee  rj  tae  tre  wei  bey  bray  dray  flay  neigh  parquet  belay  brae  cay  fey  shay  purvey  underplay  trey  aurae  hurray  umbrae  underpay  aweigh  stay  survey  essay  obey  okay  spray  betray  cafe  interplay  repay  stray  sway  astray  oj  attache  bouquet  defray  ij  ok  overlay  papillae  bj  bk  dossier  fj  nebulae  puree  tj  zwei  soiree  filet  splay  byplay  moray  patellae  sachet  toupee  hooray  medullae  outplay  reweigh  spay  display  convey  dismay  portray  runaway  vertebrae  cliche  disarray  disobey  lamellae  waterway  emigre  matinee  naturae  replay  saute  alleyway  crochet  croquet  fistulae  getaway  risque  souffle  wordplay  castaway  fibulae  hideaway  inveigh  airplay  nisei  pleurae  prepay  sorbet  soubriquet  stowaway  noway  overpay  overplay  roundelay  urethrae  briquet  layaway  outstay  bobsleigh  copay  copulae  misplay  tearaway  anyway  everyday  yesterday  holiday  formulae  halfway  faraway  naivete  passageway  protege  sequelae  cabaret  francais  gangway  microarray  toothache  breakaway  lingerie  maxillae  scapulae  sobriquet  workaday  caraway  giveaway  ricochet  throwaway  resurvey  stingray  takeaway  flyaway  macrame  overstay  sickbay  caesurae  uvulae  foldaway  penumbrae  respray  tarantulae  communique  straightaway  cabriolet  carriageway  salmonellae  cybercafe  walkaway  societe  trabeculae  companionway  caravanserais