pound cake vs sponge cake

pound cake

noun
  • A dense yellow cake, the traditional recipe for which consists of equal quantities (nominally one pound) of butter, eggs, flour, and sugar. 

  • A term of attraction or desire 

sponge cake

noun
  • A light, soft, baked dessert (commonly layered with cream and jam) that is typically made with flour, sugar, baking powder and eggs, and has a firm, yet well aerated structure, similar to that of a sea sponge. 

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