billboard vs write up

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. 

write up

verb
  • Used other than figuratively or idiomatically: see write, up. 

  • To write about positively; to praise in writing. 

  • To annotate a stamp album page with details about the stamp, such as die used or colour variety. 

  • To document officially the faults, offenses, or wrongdoing of. 

  • To make an upward adjustment in the value of an asset. 

  • To produce by writing. 

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