Here's what rhymes with kowhaiwhai.
                        
                        
                    
                                why  y  wir  wai  by  my  high  die  lie  thy  buy  guy  tie  vi  hi  shy  sigh  bi  bye  chi  dye  fi  hy  nigh  pi  pie  thai  thigh  vie  dei  ly  psi  quae  rye  ty  awry  hai  lye  mai  muy  nai  wry  cy  fy  kai  lai  luy  mei  sy  tai  thei  phi  dry  try  cry  fly  sky  spy  fry  ply  sly  pry  tri  trie  pri  overlie  sty  aquae  spry  stye  overbuy  slier  apply  supply  thereby  deny  rely  whereby  hereby  defy  belie  untie  codify  ossify  amebae  turfy  lanai  overfly  scurfy  shanghai  reply  imply  nearby  comply  classify  verify  certify  glorify  goodbye  notify  alibi  pacify  samurai  decry  falsify  pupae  amoebae  crucify  descry  edify  vilify  bonsai  deify  firefly  retry  vivify  blowfly  calcify  horrify  stupefy  versify  ripply  banzais  justify  occupy  satisfy  clarify  modify  nuclei  qualify  specify  alkali  signify  testify  gratify  purify  underlie  alveoli  fortify  nullify  ratify  standby  unify  lullaby  termini  terrify  typify  liquefy  mollify  mortify  oversupply  ramify  resupply  acidify  mystify  triply  misapply  liquify  scarify  barfly  mummify  vitrify  drachmai  speechify  yuppify  stimuli  simplify  butterfly  quantify  amplify  diversify  magnify  rectify  beautify  solidify  dignify  personify  stratify  stultify  ultrahigh  emulsify  petrify  reclassify  reunify  revivify  cumuli  declassify  hyperbolae  prettify  beatify  refortify  syllabify  dandify  identify  multiply  intensify  disqualify  demystify  detoxify  dragonfly  electrify  dissatisfy  gentrify  solemnify  exemplify  indemnify  objectify  oversimplify  preoccupy  misidentify  transmogrify