avidity vs zeal

avidity

noun
  • Eagerness; intenseness of desire. 

  • Greediness; strong appetite. 

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

zeal

noun
  • The fervour or tireless devotion for a person, cause, or ideal and determination in its furtherance; diligent enthusiasm; powerful interest. 

  • The collective noun for a group of zebras. 

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