billfold vs coffer

billfold

noun
  • A small, folding sleeve or case designed to hold paper currency, as well as credit cards, pictures, etc. 

coffer

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

  • 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 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. 

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