common bean vs green bean

common bean

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

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

green bean

noun
  • The immature pods of numerous varieties of the common bean, Phaseolus vulgaris. 

  • The immature pods of any kind of bean plant, eaten as a vegetable. 

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