common bean vs pigeon pea

common bean

noun
  • A bean of such a plant, varying in size, shape and especially color. 

  • An herbaceous annual plant (Phaseolus vulgaris), grown for its edible bean. 

pigeon pea

noun
  • The edible seed of this plant. 

  • A tropical African plant, Cajanus cajan, formerly Cajanus indicus. 

How often have the words common bean and pigeon pea occurred in a corpus of books? (source: Google Ngram Viewer )