cellar spider vs reaper

cellar spider

noun
  • Pholcus phalangioides, a spider of the family Pholcidae. 

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. 

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