billfold vs receptacle

billfold

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

receptacle

noun
  • A container. 

  • In the Asteraceae (aster or sunflower family), the end of the peduncle to which all of the florets of the flower head are attached. 

  • A contact device installed at an outlet for the connection of an attachment plug (typically by receiving the plug's prongs) to supply portable appliances or equipment. 

  • A structure at the end of a branch of an alga containing conceptacles (reproductive organs). 

  • An organ that receives and holds a secretion. 

  • The part of the flower stalk (peduncle or pedicel) to which the floral parts are attached; a thalamus, a torus. 

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