foreman vs slave-driver

foreman

noun
  • A slave assistant to the white overseer who managed field hands. 

  • The leader of a work crew. 

  • The member of a jury who presides over it and speaks on its behalf. 

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 foreman and slave-driver occurred in a corpus of books? (source: Google Ngram Viewer )