laborer vs reaper

laborer

noun
  • One who uses body strength instead of intellectual power to earn a wage, usually hourly. 

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. 

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