Nat vs mutt

Nat

noun
  • A member or supporter of the Scottish National Party. 

  • A member or supporter of the Australian National Party. 

  • A member or supporter of the New Zealand National Party. 

name
  • A diminutive of the female given name Natasha, Natalie, Natalia 

  • A diminutive of the male given name Nathanael, Nathaniel, Nathan 

  • A surname 

mutt

noun
  • A person of mixed racial or ethnic ancestry. 

  • A mongrel dog (or sometimes cat); an animal of mixed breed or uncertain origin. 

  • An idiot, a stupid person. 

  • A person from the United States, in reference to sense 2. 

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