affiche vs announcement

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. 

announcement

noun
  • An act of announcing, or giving notice. 

  • That which conveys what is announced. 

  • The content which is announced. 

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