denier vs greenback

denier

noun
  • An old French coin worth one-twelfth of a sou. 

  • One who denies or forbids something. 

  • One who denies the existence of something. 

  • A unit of linear density which indicates the fineness of fiber or yarn, equal to one gram per 9000 meters, used especially to measure or indicate the fineness of hosiery. Originally equal to the weight of a denier coin per 9600 aunes. 

greenback

noun
  • A unit of American currency issued during the Civil War by the Treasury Department. 

  • The United States dollar. 

  • A wave that has not yet begun to break. 

  • Any bill that is legal tender in the US (originally printed with green and black ink) issued by the Federal Reserve. 

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