merchant marine vs transport

merchant marine

noun
  • A ship dedicated to commercial, rather than military, purposes. 

  • Synonym of merchant navy. The fleet considered as an entire combined force. 

transport

noun
  • A vehicle used to transport (passengers, mail, freight, troops etc.) 

  • The state of being transported by emotion; rapture. 

  • An act of transporting; conveyance. 

  • A tractor-trailer. 

  • A deported convict. 

  • A device that moves recording tape across the read/write heads of a tape recorder or video recorder etc. 

  • The system of transporting passengers, etc. in a particular region; the vehicles used in such a system. 

verb
  • To carry or bear from one place to another; to remove; to convey. 

  • To deport to a penal colony. 

  • To move (someone) to strong emotion; to carry away. 

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