kuchen vs layer cake

kuchen

noun
  • Any of several types of cake, typically eaten with coffee. 

layer cake

noun
  • A cake consisting of multiple stacked sheets of cake, held together by frosting or jam, etc. 

  • A type of layering of materials, used in some nuclear bombs. 

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