reaper vs violin spider

reaper

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

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

  • A machine used to harvest crops. 

violin spider

noun
  • Any recluse spider (Loxosceles and Sicarius spp.), known for the violin-shaped marking on its thorax. 

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