bill vs greenback

bill

noun
  • A piece of paper money; a banknote. 

  • A writing binding the signer or signers to pay a certain sum at a future day or on demand, with or without interest, as may be stated in the document; a bill of exchange. In the United States, it is usually called a note, a note of hand, or a promissory note. 

  • The beak of a bird, especially when small or flattish; sometimes also used with reference to a platypus, turtle, or other animal. 

  • Of a cap or hat: the brim or peak, serving as a shade to keep sun off the face and out of the eyes. 

  • A written list or inventory. (Now obsolete except in specific senses or set phrases; bill of lading, bill of goods, etc.) 

  • A document, originally sealed; a formal statement or official memorandum. (Now obsolete except with certain qualifying words; bill of health, bill of sale etc.) 

  • The extremity of the arm of an anchor; the point of or beyond the fluke (also called the peak). 

  • A cutting instrument, with hook-shaped point, and fitted with a handle, used in pruning, etc.; a billhook. 

  • The bell, or boom, of the bittern. 

  • A written note of goods sold, services rendered, or work done, with the price or charge; an invoice. 

  • Any of various bladed or pointed hand weapons, originally designating an Anglo-Saxon sword, and later a weapon of infantry, especially in the 14th and 15th centuries, commonly consisting of a broad, heavy, double-edged, hook-shaped blade, with a short pike at the back and another at the top, attached to the end of a long staff. 

  • One hundred dollars. 

  • A pickaxe, or mattock. 

  • A beak-like projection, especially a promontory. 

  • A set of items presented together. 

  • Somebody armed with a bill; a billman. 

  • A draft of a law, presented to a legislature for enactment; a proposed or projected law. 

  • A paper, written or printed, and posted up or given away, to advertise something, as a lecture, a play, or the sale of goods 

verb
  • To dig, chop, etc., with a bill. 

  • To advertise by a bill or public notice. 

  • To charge; to send a bill to. 

  • to stroke bill against bill, with reference to doves; to caress in fondness 

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 bill and greenback occurred in a corpus of books? (source: Google Ngram Viewer )