disloyalty vs zeal

disloyalty

noun
  • The quality of being disloyal. 

  • An act of being disloyal; a betrayal, faithbreach. 

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 disloyalty and zeal occurred in a corpus of books? (source: Google Ngram Viewer )