potable vs winecup

potable

noun
  • Any drinkable liquid; a beverage. 

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

winecup

noun
  • The consumption of alcohol; drinking; alcohol as a drink. 

  • A vessel from which wine is drunk. 

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