avidity vs voracity

avidity

noun
  • Greediness; strong appetite. 

  • The measure of the synergism of the strength of individual interactions between proteins. 

  • Eagerness; intenseness of desire. 

voracity

noun
  • the state of being voracious; rapacity or extreme gluttony 

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