parenticide vs war crime

parenticide

noun
  • A person who kills his or her parent. 

  • The killing of a parent. 

war crime

noun
  • Coordinate terms: crime against humanity, genocide 

  • A punishable offense, under international law, for violations of the law of war by any person or persons, military or civilian. 

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