foreman vs overman

foreman

noun
  • The leader of a work crew. 

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

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

overman

noun
  • A person who supervises others; a supervisor, especially in a mine. 

  • A person with great powers; a superman. 

verb
  • To provide with too many personnel; overstaff. 

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