bloodshed vs parenticide

bloodshed

noun
  • A slaughter; destruction of life, notably on a large scale. 

  • The shedding or spilling of blood. 

parenticide

noun
  • The killing of a parent. 

  • A person who kills his or her parent. 

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