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