Here's what rhymes with protocephalon.
                        
                        
                    
                                lawn  yon  salon  yawn  echelon  hereon  upon  don  non  drawn  gone  von  con  dawn  thereon  hon  wan  bon  fawn  han  pawn  schon  yuan  bonne  khan  sawn  sonne  vpon  brawn  prawn  epsilon  faun  john  gnawn  thereupon  baton  foregone  spawn  swan  whereon  fagon  hexagon  chiffon  forgone  hereupon  overdrawn  pecan  aileron  carillon  lasagne  upsilon  methadon  withdrawn  whereupon  positron  marathon  paragon  redrawn  begone  chaperon  tenon  amazon  predawn  outdrawn  undergone  lexicon  polygon  octagon  antiphon  mastodon  tarragon  autobahn  heptagon  neocon  trimaran  emoticon  phenomenon  automaton  denouement  pantheon  pentagon  woebegone  leprechaun  cordovan  frogspawn  rapprochement  pantechnicon  Words that almost rhyme with protocephalon
long  along  wrong  rom  salaam  strong  com  song  calm  bomb  palm  mom  bom  homme  throng  vom  balm  gong  nom  som  tom  dong  mam  prom  prong  thong  aplomb  pom  pong  tong  bong  erelong  iamb  belong  quam  prolong  pogrom  twang  qualm  sarong  firebomb  lifelong  intercom  singsong  embalm  livelong  yearlong  consomme  mahjong  nightlong  becalm  supermom  cardamom  dingdong  yarn  forlorn  lorn  born  corn  borne  torn  worn  barn  horn  warn  adorn  morn  mourn  thorn  shorn  darn  porn  tarn  scorn  sworn  unborn  reborn  forborne  forewarn  unworn  lowborn  firstborn  outworn  stillborn  careworn  forsworn  lovelorn  peppercorn  foresworn  unicorn  waterborne  timeworn  sweetcorn