organ vs pipework

organ

noun
  • A musical instrument that has multiple pipes which play when a key is pressed (the pipe organ), or an electronic instrument designed to replicate such. 

  • The larger part of an organism, composed of tissues that perform similar functions. 

  • A government organization; agency; authority. 

  • A body of an organization dedicated to the performing of certain functions. 

  • An official magazine, newsletter, or similar publication of an organization. 

  • An Asian form of mitrailleuse. 

  • The penis. 

pipework

noun
  • Any system of pipes or tubes; piping 

  • The pipes and stops of an organ 

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