bloodbath vs bloodletting

bloodbath

noun
  • An aggressive or very violent contest or confrontation. 

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

  • Indiscriminate killing or slaughter; a massacre. 

  • 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. 

bloodletting

noun
  • A circumstance, such as a battle, where a large amount of blood is likely to be spilled through violence. 

  • The archaic practice of treating illness by removing some blood, believed to be tainted, from the stricken person. 

  • The diminishment of any resource with the hope that this will lead to a positive effect. 

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