Here's what rhymes with undercosts.
                        
                        
                    
                                costs  frosts  Words that almost rhyme with undercosts
wasps  courts  carts  course  parts  thoughts  hearts  wants  lots  ports  sorts  charts  coarse  faults  quartz  salts  shots  assaults  dots  forts  knots  pots  adopts  cops  cos  haunts  mosques  shorts  vaults  clots  cocks  darts  fonts  quarts  waltz  warts  watts  across  force  loss  source  box  cross  horse  false  marks  rocks  crops  intercourse  shops  sports  spots  starts  supports  talks  boss  corpse  parks  plots  tops  walks  fox  locks  moss  sauce  shocks  clocks  cloths  departs  docks  docs  dos  farce  forks  fourths  gloss  hoarse  pox  sharks  slots  socks  toss  barks  chops  defaults  hawks  hops  knocks  moths  perforce  reports  blocks  divorce  drops  imports  stocks  counterparts  stops  flocks  prompts  props  resorts  sparks  sparse  stalks  blocs  distorts  dwarfs  imparts  retorts  troughs  remarks  enforce  paradox  remorse  restaurants  transports  endorse  swamps  outcrops  response  orthodox  renaissance  patriarchs  unorthodox  reinforce