bankroll vs billfold

bankroll

noun
  • A roll of banknotes or other paper currency, carried in lieu of a wallet. 

  • The monetary assets of a person or organization. 

verb
  • To fund a project; to underwrite something. 

billfold

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

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