trunking vs water carrier

trunking

noun
  • A system of ducts for cables, heating or ventilation. 

  • The movement of containers or packages between a terminal and a transporter's inland facilities, or the scheduled transportation service between locations. 

  • All the electrical and communications cables bundled together and distributed through a building. 

  • Plastic conduit or duct used to conceal and protect electrical wiring. 

  • A two-way radio technique that uses a control channel to automatically assign frequency channels to groups of user radios. 

water carrier

noun
  • A pipe or tube that conveys water. 

  • An arrangement of wires on which a bucket of water, raised from a well, etc., may be conveyed wherever required, as to a house. 

  • A person who carries water from a spring or well, especially in antiquity and pre-modern era when it was a common job. 

  • A transportation ship that is water-based. 

  • An individual doing simple, ordinary work, usually in opposition to somebody considered more valuable. 

  • Aquarius, or a symbol for it. 

  • A domestique. 

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