mutt vs owlet

mutt

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

  • A person of mixed racial or ethnic ancestry. 

  • An idiot, a stupid person. 

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

owlet

noun
  • A young owl; owling. 

  • One of a species of small owls, such as Athene noctua. 

  • An owlet moth. 

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