Here's what rhymes with oncien.
                        
                        
                    
                                Words that almost rhyme with oncien
onion  anon  unman  oven  dungeon  luncheon  unction  gunman  bunion  sudden  button  cousin  dozen  summon  mutton  sullen  sultan  muslin  fuckin  huntsman  yeomen  gulden  muffin  coven  dudgeon  toughen  mullion  piton  roughen  nubbin  grunion  dubbin  kuchen  someone  suction  sunken  tungsten  globin  irruption  bludgeon  glutton  dustpan  lumpen  scullion  scutcheon  dustman  stuntman  biathlon  function  corruption  junction  drunken  eruption  emulsion  percussion  perdition  shrunken  avulsion  exciton  escutcheon  gumption  unbutton  caparison  decagon  discussion  assumption  reduction  induction  combustion  deduction  abduction  repulsion  seduction  androgen  concussion  revulsion  impulsion  production  conduction  compulsion  disruption  expulsion  injunction  interruption  resumption  convulsion  propulsion  semicolon  subduction  repercussion  ragamuffin  bellybutton  consumption  destruction  instruction  conjunction  dysfunction  obstruction  presumption  disjunction  malfunction  compunction  liposuction  construction  introduction  reproduction  transduction  overproduction  reconstruction  deconstruction  reintroduction  underproduction  misconstruction