c-note vs yearthousand

c-note

noun
  • A one-hundred dollar banknote. 

  • The lowest note of an instrument, written below the staff and the D note. 

yearthousand

noun
  • Meronym: yearhundred 

  • A millennium (a period of a thousand years). 

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