Hitlerism vs anti-Semitism

Hitlerism

noun
  • The political philosophy and practices of Adolf Hitler and the Nazi party. 

anti-Semitism

noun
  • Prejudice, discrimination or hostility directed against any Semitic people (ancient or modern), such as Samaritans, Palestinians, Arabs or Assyrians. 

  • Prejudice, discrimination, hostility or political or religious opposition directed against ethnic or religious Jews or against Judaism; antijudaism; judeophobia. 

How often have the words Hitlerism and anti-Semitism occurred in a corpus of books? (source: Google Ngram Viewer )