preserve vs treasure

preserve

verb
  • To protect; to keep from harm or injury. 

  • To save from decay by the use of some preservative substance, such as sugar or salt; to season and prepare (fruits, meat, etc.) for storage. 

  • To maintain throughout; to keep intact. 

noun
  • An activity with restricted access. 

  • A sweet spread made of any of a variety of fruits. 

  • A reservation, a nature preserve. 

treasure

verb
  • To store or stow in a safe place. 

  • To consider to be precious; to value highly. 

noun
  • A term of endearment. 

  • A collection of valuable things; accumulated wealth; a stock of money, jewels, etc. 

  • Anything greatly valued. 

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