broomrape vs harvestman

broomrape

noun
  • Any of various plants, of the genus Orobanche, that are parasitic on the roots of other plants. 

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. 

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