treasure vs treasure-trove

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. 

treasure-trove

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