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