army vs merchant marine

army

noun
  • A large, highly organized military force, concerned mainly with ground (rather than air or naval) operations. 

  • Used absolutely for that entire branch of the armed forces. 

  • The governmental agency in charge of a state's army. 

  • Within a vast military, a very large tactical contingent (e.g. a number of divisions). 

  • The military as a whole. 

  • Any multitude. 

  • A large group of people working toward the same purpose. 

  • A large group of social animals working toward the same purpose. 

merchant marine

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

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

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