sugar-plum vs treasure

sugar-plum

noun
  • Term of endearment: sweetheart, darling. 

  • A round or oval sweet/piece of candy made of boiled sugar. 

treasure

noun
  • A term of endearment. 

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

  • 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 sugar-plum and treasure occurred in a corpus of books? (source: Google Ngram Viewer )