amass vs conserve

amass

verb
  • To accumulate; to assemble. 

  • to gather a great quantity of; to accumulate. 

  • To collect into a mass or heap. 

conserve

verb
  • To remain unchanged during a process 

  • To protect an environment, heritage, etc. 

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

noun
  • Wilderness where human development is prohibited. 

  • A jam or thick syrup made from fruit. 

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