carnage vs mass murder

carnage

noun
  • Death and destruction. 

  • The corpses, gore, etc. that remain after a massacre. 

  • Any great loss by a team; a game in which one team wins overwhelmingly. 

  • Any chaotic situation. 

mass murder

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

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