pipework vs spigot

pipework

noun
  • Any system of pipes or tubes; piping 

  • The pipes and stops of an organ 

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 pipework and spigot occurred in a corpus of books? (source: Google Ngram Viewer )