dook vs dulce de leche

dook

noun
  • dookie; feces 

  • A certain clucking sound made by ferrets. 

  • a strong, untwilled linen or cotton. 

  • A plug of wood driven into a wall to hold a nail, etc. 

verb
  • To make a certain clucking sound. 

dulce de leche

noun
  • A South American sweet spread made from sugar and boiled milk. 

How often have the words dook and dulce de leche occurred in a corpus of books? (source: Google Ngram Viewer )