Here's what rhymes with clayness.
                        
                        
                    
                                anus  heinous  plainness  Words that almost rhyme with clayness
famous  ignoramus  mandamus  gracious  greatness  lateness  basis  courageous  aimless  painless  sameness  ageless  fracas  graceless  agents  patience  ancients  spacious  stainless  cadence  nameless  outrageous  valence  audacious  blameless  capacious  faithless  fallacious  herbaceous  hiatus  shameless  shapeless  voracious  waitress  bailiffs  baseless  faceless  faintness  ungracious  quaintness  salacious  straightness  weightless  patients  acquaintance  ailments  claimants  contagious  fragrance  platelets  reagents  tenacious  abeyance  sebaceous  strangeness  tasteless  vexatious  vivacious  flirtatious  loquacious  arrangements  payments  conveyance  impatience  surveillance  attainments  efficacious  assailants  pavements  placements  basements  complainants  complaisance  vagrants  mendacious  statements  rearrangements  repayments  inpatients  advantageous  engagements  replacements  ostentatious  emplacements  displacements  entertainments  homeostasis  misstatements  disadvantageous