catgut vs goat's rue

catgut

noun
  • Tephrosia virginiana (goat's rue, devil's shoestring). 

  • A sort of linen or canvas, with wide interstices. 

  • The material from which such cords are made. 

  • A cord of great toughness made from the intestines of animals, especially of sheep, used for strings of musical instruments, racquets, sutures etc. 

goat's rue

noun
  • Tephrosia virginiana (catgut, devil's shoestring), native to the United States. 

  • Tephrosia lindheimeri (Lindheimer's hoarypea), of Texas. 

  • Galega officinalis (French lilac, Italian fitch, Spanish sainfoin). 

How often have the words catgut and goat's rue occurred in a corpus of books? (source: Google Ngram Viewer )