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