Here's what rhymes with optr.
                        
                        
                    
                                helicopter  Words that almost rhyme with optr
altar  alter  otter  water  author  daughter  offer  copper  doctor  honor  charter  shorter  foster  armor  armour  martyr  mortar  barter  hotter  mater  porter  softer  chopper  hopper  pauper  poplar  potter  roster  auger  falter  garter  halter  tartar  augur  carter  saunter  shopper  sorter  totter  order  father  former  longer  proper  corner  quarter  dollar  farmer  farther  horror  lawyer  partner  bother  collar  marker  monster  slaughter  conquer  darker  parlor  warmer  ardor  bomber  coarser  locker  parlour  sharper  soccer  starter  taller  caller  calmer  harsher  lobster  pallor  rocker  saucer  smarter  stopper  talker  walker  washer  alder  arbor  archer  borer  boxer  carver  garner  golfer  mourner  plotter  solver  torpor  arbour  blotter  charmer  coffer  collier  dormer  dropper  hawser  holler  knocker  lager  logger  proctor  prompter  larger  smaller  border  scholar  harbor  harbour  harder  posture  reporter  torture  sponsor  supporter  wander  barber  fodder  ponder  prosper  robber  solder  yonder  conjure  importer  impostor  somber  toddler  blocker  charger  coauthor  cobbler  larder  lodger  proffer  squatter  warder  watcher  boarder  stronger  broader  improper  performer  vigour  reformer  revolver  catarrh  dishonor  exporter  informer  rigour  squalor  indorser  disorder  departure  recorder  underwater  restorer  saltwater  squander  explorer  transporter  transformer