bloodshed vs father-slayer

bloodshed

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

  • The shedding or spilling of blood. 

father-slayer

noun
  • One who kills or murders one's father; a patricide 

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