Here's what rhymes with billionaire.
                        
                        
                    
                                mare  mer  mehr  mair  their  there  where  care  aware  bear  fair  hair  share  chair  pair  rare  wear  affair  bare  dare  fare  tear  unfair  faire  hare  ware  millionaire  pear  snare  guerre  lair  affaire  cher  fere  pare  sehr  thair  millionnaire  prayer  compare  repair  spare  swear  unaware  glare  stare  flare  impair  scare  stair  flair  blare  debonair  midair  repairer  ironware  legionnaire  debonaire  funfair  square  everywhere  prepare  anywhere  beware  underwear  earthenware  doctrinaire  silverware  bugbear  curare  disrepair  ensnare  solitaire  dinnerware  outerwear  overbear  tinware  coheir  eldercare  broodmare  ovenware  declare  despair  questionnaire  forbear  thoroughfare  aftercare  horsehair  forswear  medicare  parterre  chinaware  kitchenware  spyware  beachwear  wirehair  tableware  multimillionaire  commissionaire  foursquare  maidenhair  foreswear  camelhair  backstair  setsquare  concessionaire  extraordinaire  Words that almost rhyme with billionaire
nel  knell  nell  well  cell  tell  fell  del  sell  bell  hell  shell  smell  gel  tel  dell  delle  yell  belle  celle  unwell  weal  bel  lapel  sel  telle  jell  morel  noel  parallel  compel  dwell  spell  swell  repel  gaol  motel  nouvelle  propel  quell  gazelle  impel  quel  organelle  resell  retell  nacelle  novelle  personnel  hotel  clientele  excel  befell  cartel  pastel  carousel  decibel  caravel  undersell  carrousel  outsell  oversell  farewell  citadel  dispel  expel  infidel  foretell  fontanelle  photocell  bagatelle  commonweal  misspell  zinfandel  mademoiselle  materiel  nonparallel  muscatel  tagliatelle  antipersonnel  therefor