affiche vs billboard

affiche

noun
  • A written or printed notice to be posted, as on a wall; a poster; a placard. 

verb
  • To fix, fasten; to fix a poster or placard to a wall. 

  • To parade, to advertise, publicise; to display, show. 

billboard

noun
  • A very large outdoor sign, generally used for advertising. 

  • A sprite that always faces the screen, no matter which direction it is looked at from. 

  • A piece of thick plank, armed with iron plates, and fixed on the bow or fore-channels of a vessel, for the bill or fluke of the anchor to rest on. 

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