Here's what rhymes with castoroides.
                        
                        
                    
                                voids  choroids  avoids  solenoids  asteroids  hemorrhoids  adenoids  haemorrhoids  paranoids  cuboids  alkaloids  humanoids  mongoloids  carotenoids  anthropoids  Words that almost rhyme with castoroides
droits  quoits  introits  loins  roils  boys  noise  soils  coins  coils  joins  joys  toys  boils  moins  poise  toils  foils  groins  broils  ploys  groynes  cloys  doyens  purloins  moils  spoils  sepoys  adjoins  annoys  deploys  recoils  rejoins  viceroys  quoins  subjoins  trefoils  goitres  sirloins  reboils  destroys  employs  enjoys  employes  enjoins  conjoins  corduroys  despoils  uncoils  embroils  killjoys  overjoys  hydrofoils  tenderloins  redeploys  gumboils  reconnoitres  reemploys