activity vs zest

activity

noun
  • Something done for pleasure or entertainment, especially one involving movement or an excursion. 

  • The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point. 

  • Something done as an action or a movement. 

  • The state or quality of being active; activeness. 

  • The number of radioactive decays per unit time. Unit for it: becquerel or curie 

  • The propery of substances to react with other substances 

zest

noun
  • Enthusiasm; keen enjoyment; relish; gusto. 

  • The outer skin of a citrus fruit, used as a flavouring or garnish. 

  • General vibrance of flavour. 

  • The woody, thick skin enclosing the kernel of a walnut. 

verb
  • To scrape the zest from a fruit. 

  • To make more zesty. 

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