coffer vs plafond

coffer

noun
  • An ornamental sunken panel in a ceiling or dome. 

  • A trench dug in the bottom of a dry moat, and extending across it, to enable the besieged to defend it with raking fire. 

  • A strong chest or box used for keeping money or valuables safe. 

  • A cofferdam. 

  • A supply or store of money, often belonging to an organization. 

verb
  • To put money or valuables in a coffer 

  • To decorate something, especially a ceiling, with coffers. 

plafond

noun
  • A ceiling, especially one that is ornately decorated. 

  • The tibial plafond. 

  • A painting or decoration on a ceiling. 

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