corvee vs farmhand

corvee

noun
  • Unpaid labor required by a feudal lord. 

  • Labor, especially for roads or dams, in lieu of taxes. 

farmhand

noun
  • A person who works on a farm. 

  • A player in the minor leagues. 

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