mustelid vs varmint

mustelid

noun
  • Any carnivorous mammal of the diverse weasel family Mustelidae, which also includes badgers, otters, martens, mink and wolverines. 

varmint

noun
  • A pestering animal such as one that kills or harasses a farmer's livestock or crops. 

  • An obnoxious person or troublemaker. 

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