gardener vs reaper

gardener

noun
  • One who gardens; one who grows plants or cultivates a garden. 

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 gardener and reaper occurred in a corpus of books? (source: Google Ngram Viewer )