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