appetite vs passionateness

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. 

passionateness

noun
  • The condition of being passionate. 

  • A passionate act. 

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