Here's what rhymes with crustaceus.
                        
                        
                    
                                basis  homeostasis  Words that almost rhyme with crustaceus
bases  spaces  spacious  chases  cases  places  faces  races  traces  vases  audacious  braces  herbaceous  laces  sebaceous  mesas  phases  phrases  gracious  raises  praises  tenacious  capacious  fallacious  gazes  vivacious  voracious  flirtatious  salacious  efficacious  vexatious  fireplaces  glazes  ungracious  loquacious  mendacious  metastases  ostentatious  paraphrases  baseless  famous  stainless  heinous  hiatus  painless  tasteless  bailiffs  faceless  plainness  fracas  patience  payments  courageous  cadence  contagious  nameless  outrageous  valence  abeyance  blameless  faithless  sameness  shameless  shapeless  waitress  basements  lateness  mandamus  graceless  straightness  weightless  patients  statements  greatness  surveillance  fragrance  platelets  assailants  pavements  placements  strangeness  complaisance  faintness  acquaintance  advantageous  conveyance  impatience  attainments  claimants  reagents  repayments  vagrants  ignoramus  quaintness  arrangements  displacements  replacements  complainants  emplacements  inpatients  misstatements  engagements  entertainments  disadvantageous  rearrangements