Here's what rhymes with carboxyl.
                        
                        
                    
                                fill  hill  sill  ville  fil  fille  vill  shill  will  still  till  bill  kill  skill  mill  chill  thrill  mil  nil  pill  shrill  spill  til  ftill  gill  grill  quill  chil  grille  mille  quelle  rill  wil  wilh  dill  frill  krill  swill  drill  fulfill  anil  downhill  nihil  uphill  benzyl  trill  twill  dunghill  gerbil  brill  pigswill  until  goodwill  hydroxyl  instill  instil  untill  distil  distill  freewill  overkill  overfill  neutrophil  quadrille  daffodil  deshabille  dishabille  overspill  watermill  roadkill  fiberfill  espadrille  eosinophil  Words that almost rhyme with carboxyl
fear  shear  sheer  feare  veer  vere  vir  sear  sere  year  clear  near  dear  mere  career  sphere  beer  rear  deer  gear  peer  cheer  pier  queer  spear  steer  smear  cashier  mir  sneer  cohere  leer  yeare  jeer  cushier  appear  severe  adhere  austere  revere  veneer  auctioneer  biosphere  inhere  servir  amir  emir  tapir  vizir  blear  besmear  leafier  bawdier  cafetiere  pioneer  sincere  premier  unclear  premiere  cavalier  persevere  lithosphere  troposphere  domineer  gazetteer  compeer  killdeer  thornier  rainier  brainier  grainier  hornier  cornier  downier  atmosphere  disappear  frontier  interfere  reappear  brigadier  souvenir  chevalier  privateer  bombardier  gondolier  hydrosphere  profiteer  mesosphere  racketeer  triumvir  balladeer  chanticleer  exosphere  marketeer  bathysphere  lavalier  junketeer  runtier  engineer  hemisphere  volunteer  financier  insincere  chandelier  charioteer  stratosphere  acyclovir  pamphleteer  yesteryear  commandeer  muleteer  bandolier  mutineer  bandoleer  electioneer  fusileer  mountaineer  scrutineer  conventioneer