liqueur vs schnapps

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 

schnapps

noun
  • A type of distilled alcoholic beverage (liquor), often with a herbal or fruit flavoring, typically drunk neat as an apéritif or digestif. 

  • A serving of this beverage. 

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