harvestman vs insect

harvestman

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

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

insect

noun
  • An arthropod (in the Insecta class) characterized by six legs, up to four wings, and a chitinous exoskeleton. 

  • A contemptible or powerless person. 

  • Any small arthropod similar to an insect, including spiders, centipedes, millipedes, etc. 

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