hired hand vs mower

hired hand

noun
  • A person who is employed to perform routine chores and manual labor, especially on a farm or ranch. 

mower

noun
  • A farm machine used in hay production (sickle mower, finger-bar mower). 

  • A lawnmower, a machine used to cut grass on lawns. 

  • A person who cuts grass. 

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