Untermensch vs nonperson

Untermensch

noun
  • An inferior person; a subhuman, especially in a Nazi racial hierarchy. 

nonperson

noun
  • Not a legal entity. 

  • Not a real person; a subhuman. 

  • Something other than a person; an object. 

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