conserve vs waternut

conserve

noun
  • A jam or thick syrup made from fruit. 

  • Wilderness where human development is prohibited. 

verb
  • To protect an environment, heritage, etc. 

  • To remain unchanged during a process 

  • To save for later use, sometimes by the use of a preservative. 

waternut

noun
  • Synonym of jelly coconut 

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