Here's what rhymes with superfluo.
                        
                        
                    
                                wo  woe  whoa  no  so  know  go  though  low  show  co  row  tho  fo  foe  ho  lo  quo  bo  doe  dough  mo  po  ro  toe  tow  yo  beau  ceux  faut  goe  hoe  jo  ko  sew  soe  vo  beaux  cho  dau  mow  noe  roe  sho  tuo  yeux  zo  rho  doh  although  ago  flow  blow  grow  slow  snow  throw  pro  glow  fro  chateau  crow  folio  hello  thro  bio  forego  forgo  uno  floe  bro  chateaux  stow  throe  trow  chapeau  oleo  sloe  foreknow  kayo  chapeaux  borzoi  schmo  resew  schmoe  below  ratio  radio  plateau  audio  bestow  buffalo  stereo  nouveau  polio  propos  tableau  aglow  aliquot  dicho  escrow  rodeo  siglo  tableaux  topos  dunno  plateaux  trousseau  kapok  tarot  turbot  deathblow  regrow  gateau  fatso  gateaux  pekoe  trousseaux  romeo  embryo  overthrow  studio  overflow  patio  calico  dynamo  vertigo  apropos  cameo  domino  mistletoe  outgrow  spatio  adagio  piccolo  pistachio  overgrow  bandeau  matzoh  tallyho  portfolio  undergo  indigo  portico  bungalow  politico  medico  presidio  afterglow  oregano  undertow  pompano  mustachio  microdot  impresario  pianissimo  moustachio  archipelago  braggadocio  generalissimo