appetite vs enthusiasm

appetite

noun
  • Any strong desire; an eagerness or longing. 

  • Desire to eat food or consume drink. 

  • The desire for some personal gratification, either of the body or of the mind. 

enthusiasm

noun
  • Intensity of feeling; excited interest or eagerness. 

  • Something in which one is keenly interested. 

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