carbohydrate vs sugar beet

carbohydrate

noun
  • A sugar, starch, or cellulose that is a food source of energy for an animal or plant. 

  • Any food rich in starch or other carbohydrates. 

sugar beet

noun
  • A type of beet whose root contains a high concentration of sucrose. 

  • darling; sweetheart 

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