appetite vs proclivity

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. 

proclivity

noun
  • A predisposition or natural inclination, propensity, or a predilection; especially, a strong disposition or bent. 

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