potable vs whisky

potable

noun
  • Any drinkable liquid; a beverage. 

adj
  • Good for drinking without fear of disease or poisoning. 

whisky

noun
  • A drink of this liquor. 

  • An alcoholic liquor distilled from fermented grain and usually aged in oak barrels. 

  • A light gig or carriage. 

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