bloodbath vs mass murder

bloodbath

noun
  • Indiscriminate killing or slaughter; a massacre. 

  • A large financial loss or massive layoff brought about by negative economic conditions. 

  • An aggressive or very violent contest or confrontation. 

  • A bath taken in warm blood used as a restorative or medical treatment. 

  • An upset (as of a game with unexpected results, or a national presidential convention) or heavy defeat. 

mass murder

noun
  • The killing of a large number of people over a short period of time. 

How often have the words bloodbath and mass murder occurred in a corpus of books? (source: Google Ngram Viewer )