Here's what rhymes with polychaetes.
                        
                        
                    
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shapes  tapes  capes  rapes  shades  grapes  raids  fades  maids  arcades  babes  drapes  grades  trades  blades  escapes  barricades  parades  spades  braids  glades  palisades  scrapes  evades  decades  brigades  pervades  crusades  grenades  invades  colonnades  degrades  persuades  accolades  blockades  brocades  stockades  tirades  cascades  upgrades  videotapes  masquerades  promenades  renegades  escapades  balustrades  case  face  makes  base  race  takes  pace  chase  lakes  saints  tastes  cakes  lace  paints  vase  wastes  faiths  shakes  wakes  mace  partakes  pastes  rakes  waists  faints  fakes  maths  safes  place  space  grace  trace  breaks  replace  snakes  stakes  brace  brakes  erase  flakes  apace  retrace  awakes  efface  steaks  forsakes  pertinacious  reiterates  debase  deface  database  disgrace  embrace  mistakes  restraints  displace  undertakes  aerospace  overtakes  anyplace  diastase  complaints  interface  fireplace  cyberspace  interlace  rattlesnakes  constraints  commonplace  marketplace