Here's what rhymes with cyclodecapentaene.
                        
                        
                    
                                pain  chain  pane  bane  tain  deign  main  brain  gain  plain  plane  rain  reign  train  attain  ln  vain  vein  cane  drain  stain  lane  sane  terrain  fain  lain  rein  mane  twain  vane  wane  feign  moraine  urbane  arraign  thane  wain  murrain  contain  maintain  obtain  campaign  domain  grain  strain  retain  entertain  insane  slain  champagne  disdain  crane  detain  mundane  pertain  ordain  butane  certaine  germane  inane  skein  sprain  swain  remain  sustain  ascertain  complain  cocaine  profane  regain  abstain  aeroplane  arcane  appertain  romaine  retrain  windowpane  chicane  ingrain  reattain  explain  refrain  humane  restrain  constrain  hurricane  cellophane  humaine  overlain  monoplane  urethane  preordain  sugarcane  halothane  inhumane  coxswain  legerdemain  hydroplane  wholegrain  demimondaine  reexplain  foreordain  polyurethane  Words that almost rhyme with cyclodecapentaene
tame  dame  same  came  name  game  blame  fame  shame  lame  maim  became  claim  frame  flame  defame  acclaim  inflame  aflame  rename  declaim  ballgame  proclaim  overcame  reclaim  disclaim  selfsame  aspartame  quitclaim  forename  exclaim  filename  counterclaim