villain vs yellow dog

villain

noun
  • An extremely depraved person, or one capable or guilty of great crimes. 

  • A vile, wicked person. 

  • Any opponent player, especially a hypothetical player for example and didactic purposes. Compare: hero (“the current player”). 

  • In fiction, a character who has the role of being bad, especially antagonizing the hero. 

  • A deliberate scoundrel. 

yellow dog

noun
  • An item or person of low value. 

  • Used other than figuratively or idiomatically: see yellow, dog. 

  • A Carolina dog. 

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