persistence vs zeal

persistence

noun
  • The property of being persistent. 

  • Continuation of the previous day's weather (particularly temperature and precipitation statistics). 

  • The number of times an operation can be iteratively applied to a number before it reaches a permanently constant state. 

  • Of data, the property of continuing to exist after the termination of the program. 

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