Here's what rhymes with prosperatum.
                        
                        
                    
                                erratum  Words that almost rhyme with prosperatum
button  mutton  glutton  piton  sudden  globin  bludgeon  dudgeon  unbutton  nubbin  dubbin  androgen  exciton  scutcheon  bellybutton  escutcheon  custom  accustom  caecum  cementum  jejunum  buxom  colostrum  buncombe  bunkum  dumdum  humdrum  corundum  secundum  conundrum  carborundum