Here's what rhymes with knowthere.
                        
                        
                    
                                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  coheir  aware  square  prayer  unfair  glare  thoroughfare  blare  midair  overbear  anywhere  despair  repair  unaware  beware  forbear  impair  curare  ensnare  horsehair  repairer  spyware  funfair  everywhere  prepare  compare  declare  underwear  earthenware  aftercare  bugbear  solitaire  forswear  medicare  parterre  chinaware  dinnerware  foursquare  maidenhair  outerwear  tinware  ironware  beachwear  foreswear  camelhair  backstair  ovenware  wirehair  millionaire  silverware  debonair  disrepair  commissionaire  eldercare  legionnaire  millionnaire  broodmare  debonaire  setsquare  questionnaire  tableware  billionaire  concessionaire  kitchenware  doctrinaire  extraordinaire  multimillionaire  Words that almost rhyme with knowthere
cell  fell  sell  hell  shell  celle  sel  novelle  well  tell  del  bell  smell  gel  spell  swell  tel  dell  delle  nel  yell  belle  motel  nouvelle  weal  bel  knell  nell  telle  jell  hotel  dwell  excel  befell  quell  gazelle  quel  resell  morel  nacelle  outsell  oversell  noel  farewell  dispel  expel  repel  foretell  gaol  unwell  impel  lapel  pastel  photocell  retell  undersell  misspell  personnel  compel  citadel  infidel  cartel  propel  carousel  decibel  organelle  caravel  carrousel  muscatel  parallel  mademoiselle  materiel  fontanelle  bagatelle  commonweal  clientele  zinfandel  antipersonnel  nonparallel  tagliatelle  therefor