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