coachwhip vs great mullein

coachwhip

noun
  • Fouquieria splendens (ocotillo). 

  • A long whip used by the driver of a horse-drawn coach. 

  • Masticophis flagellum, a colubrid snake of North America. 

great mullein

noun
  • A common herb of Europe and neighboring Africa and Asia, but widely naturalized elsewhere, Verbascum thapsus, having a flannel-like texture from course plant hairs and a tall, straight flower stalk. 

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