Here's what rhymes with imposthume.
                        
                        
                    
                                room  bloom  broom  loom  plume  rheum  whom  boom  tomb  doom  gloom  womb  groom  zoom  fume  flume  abloom  assume  resume  perfume  presume  suum  subsume  foredoom  exhume  elbowroom  entomb  legroom  boxroom  costume  consume  residuum  strongroom  Words that almost rhyme with imposthume
strewn  prune  loon  rune  soon  moon  noon  tune  balloon  boon  hewn  saloon  shewn  doin  dune  foon  toluene  coon  croon  goon  poltroon  shoon  bestrewn  immune  spoon  lagoon  platoon  aucune  baboon  buffoon  harpoon  maroon  raccoon  swoon  typhoon  bassoon  dragoon  impugn  tycoon  attune  jejune  spittoon  doubloon  patroon  racoon  afternoon  cartoon  cocoon  forenoon  opportune  pontoon  festoon  lampoon  picayune  honeymoon  monsoon  importune  protozoon  macaroon  dessertspoon  tablespoon  inopportune  spermatozoon  trinitrotoluene