least weasel vs polecat

least weasel

noun
  • The common weasel, little weasel, or simply weasel (Mustela nivalis), the smallest member of the weasel genus Mustela, native to Eurasia, North America, and North Africa. 

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 least weasel and polecat occurred in a corpus of books? (source: Google Ngram Viewer )