borecole vs kail

borecole

noun
  • A form of the kale plant, Brassica oleracea acephala, used as the vegetable spring greens / collard greens. 

kail

noun
  • A broth made with kale or other vegetables; hence, any broth; also, a dinner. 

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