first officer vs majordomo

first officer

noun
  • The executive officer, second in command of a naval vessel. 

  • Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force. 

  • Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy. 

  • The copilot of an aircraft. 

  • The chief mate of a merchant ship. 

  • The most senior civil servant in the United States Foreign Service, with responsibility for running an embassy under the authority of and reporting to the ambassador. 

majordomo

noun
  • Any overseer, organizer, person in command. 

  • The head servant or official in a royal Spanish or Italian household; later, any head servant in a wealthy household in a foreign country; a leading servant or butler. 

  • A manager of a hacienda, ranch or estate. 

How often have the words first officer and majordomo occurred in a corpus of books? (source: Google Ngram Viewer )