canapé vs layer cake

canapé

noun
  • An hors d’oeuvre, a bite-sized open-faced sandwich made of thin bread or toast topped with savory garnish. 

  • A piece of furniture similar to a couch or settee, an elegant sofa. 

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 canapé and layer cake occurred in a corpus of books? (source: Google Ngram Viewer )