Shoah vs persecution

Shoah

name
  • The systematic mass murder of six million Jews perpetrated by Nazi Germany shortly before and during World War II. 

persecution

noun
  • The act of persecuting. 

  • A program or campaign to subjugate or eliminate a specific group of people, often based on race, religion, sexuality, or social beliefs. 

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