kvass vs whiskey

kvass

noun
  • A fermented cereal-based low alcoholic beverage, often flavored with fruit, honey and herbs. 

whiskey

noun
  • A liquor distilled from the fermented mash of grain (as rye, corn, or barley). 

  • A drink of whiskey. 

  • A light gig or carriage; a tim-whiskey. 

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