kielbasa vs knackwurst

kielbasa

noun
  • A spicy, smoked sausage of a particular kind from Eastern Europe. 

  • Penis. 

knackwurst

noun
  • A highly seasoned scalded sausage made from beef, pork, and fatty tissue similar to a frankfurter, but shorter and thicker. 

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