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