bullion vs treasure

bullion

noun
  • A bulk quantity of precious metal, usually gold or silver, assessed by weight and typically cast as ingots. 

treasure

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

  • A term of endearment. 

  • Anything greatly valued. 

verb
  • To store or stow in a safe place. 

  • To consider to be precious; to value highly. 

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