mustela vs polecat

mustela

noun
  • Any of the carnivorous mammals of the genus Mustela. 

polecat

noun
  • A weasel-like animal of the genus Mustela. 

  • A tubular device used to support lights on a set. 

  • notably, the European polecat, Mustela putorius. 

  • A skunk. 

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