Here's what rhymes with certificatus.
                        
                        
                    
                                piteous  neuritis  Words that almost rhyme with certificatus
duchess  tapas  touches  clutches  incubus  cutlass  justice  compass  buttocks  buttress  pumice  talus  buckets  colourless  fulness  fungus  oneness  roughness  toughness  baseness  couplets  dullness  dulness  lustrous  numbness  rashness  stasis  bulbous  cumbrous  justness  lameness  luckless  nuggets  alumnus  hummocks  loveless  substance  abundance  circumference  encompass  muskets  wondrous  bloodless  cements  puppets  stomachs  abruptness  abutments  doublets  bluntness  fistulous  numinous  smugness  judgments  adjustments  reluctance  conductance  inductance  judgements  sumptuous  trumpets  robustness  wantonness  druggists  effulgence  pedants  consultants  indulgence  incumbents  repugnance  encumbrance  hundredths  superabundance  unrighteousness  incumbrance  resultants  reasonableness  remonstrance  readjustments  unreasonableness