harvestman vs scorpionfish

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. 

scorpionfish

noun
  • Any of the family Scorpaenidae of mostly marine fish, including many of the world's most venomous species, the "sting" taking the form of sharp spines coated with venomous mucus. 

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