genocide vs mass murder

genocide

noun
  • The systematic killing of substantial numbers of people on other grounds. 

  • A genocide will always be followed by the denial that it ever happened. 

  • The elimination of an entire class of monsters by the player. 

  • The systematic and deliberate destruction of a group of people, typically by killing substantial numbers of them, on the basis of their ethnicity, religion, or nationality. 

  • The systematic suppression of ideas or practices on the basis of cultural or ethnic origin; culturicide. 

verb
  • To commit genocide (against); to eliminate (a group of people) completely. 

mass murder

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

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