reaper vs sharecropper

reaper

noun
  • One who reaps; a person employed to harvest crops from the fields by reaping. 

  • The recluse spider (Loxosceles and Sicarius spp.). 

  • A machine used to harvest crops. 

sharecropper

noun
  • A person who enters an agreement with a land owner to farm the land and then pay a portion (share) of the produce as rent; one who sharecrops. 

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