chief mate vs monarch

chief mate

noun
  • In the merchant navy, the officer who is second in command to the captain, and whose primary duties include managing the maintenance and upkeep of the vessel. 

monarch

noun
  • A police officer. 

  • The ruler of an absolute monarchy or the head of state of a constitutional monarchy. 

  • The monarch butterfly, Danaus plexippus, and others of genus Danaus, found primarily in North America, so called because of the designs on its wings. 

  • A stag which has sixteen or more points or tines on its antlers. 

  • The chief or best thing of its kind. 

  • Any bird of the family Monarchidae. 

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