kale vs paper money

kale

noun
  • An edible plant, similar to cabbage, with curled leaves that do not form a dense head (Brassica oleracea var. acephala) 

  • Any of several cabbage-like food plants that are kinds of Brassica oleracea. 

  • Broth containing kale as a chief ingredient. 

paper money

noun
  • A type of joss paper resembling banknotes burnt to venerate the deceased, ancestor spirits, deities, etc. 

  • Cash in the form of banknotes. 

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