reaper vs sower

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. 

sower

noun
  • One who or that which sows. 

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