majordomo vs slave-driver

majordomo

noun
  • 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. 

  • Any overseer, organizer, person in command. 

  • A manager of a hacienda, ranch or estate. 

slave-driver

noun
  • An overseer of slaves at work; a person who puts slaves to work. 

  • An employer who demands excessive amounts of work from employees. 

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