cultivator vs harvestman

cultivator

noun
  • A person who cultivates. 

  • Any of several devices used to loosen or stir the soil, either to remove weeds or to provide aeration and drainage. 

harvestman

noun
  • A field-worker who works to gather in the harvest. 

  • An order of terrestrial, non-venomous arachnids with often very long legs: Opiliones. 

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