Hitlerism vs racism

Hitlerism

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

racism

noun
  • The policies, practices, or systems (e.g. government or political) promoting this belief or promoting the dominance of one or more races over others. 

  • Prejudice or discrimination based upon race or ethnicity; (countable) an action of such discrimination. 

  • The belief that there are distinct human races with inherent differences which determine their abilities, and generally that some are superior and others inferior. 

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