bibcock vs spigot

bibcock

noun
  • An appliance (typically a valve with a threaded outlet) allowing the provision of hose connections outside of buildings. 

spigot

noun
  • The plug of a faucet, tap or cock. 

  • A water tap: a faucet or sillcock. 

  • A pin or peg used to stop the vent in a cask. 

verb
  • To block with a spigot. 

  • To insert (a spigot). 

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