grappa vs liqueur

grappa

noun
  • A variety or serving of grappa. 

  • An Italian grape-based spirit of between 80 and 100 proof, made from the distillation of pomace. 

liqueur

noun
  • A flavoured alcoholic beverage that is usually very sweet and contains a high percentage of alcohol. 

verb
  • to top up bottles of sparkling wine with a sugar solution 

  • to flavor or treat (wine) with a liqueur 

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