conveyor vs message bearer

conveyor

noun
  • March 8 2023, Chris Howe, “Building the platform for Old Oak Common's platforms”, in RAIL, number 978, page 60 

  • A person that conveys, transports or delivers. 

  • A mechanical arrangement for transporting material or objects, generally over short or moderate distances, as from one part of a building to another.#* 

  • Anything that conveys, transports or delivers. 

  • The 1.7 mile-long conveyor system was commissioned in November 2022, and will remove one million lorry movements from the roads around West London. 

message bearer

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