persecution vs subjugation

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. 

subjugation

noun
  • The state of being subjugated; forced control by others. 

  • The act of subjugating. 

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