black-eyed pea vs green bean

black-eyed pea

noun
  • The edible seed of these plants. 

  • An African leguminous plant, of the species Vigna unguiculata, widely cultivated as food and forage, specifically Vigna unguiculata subsp. unguiculata. 

  • Any pale bean with a black spot. 

green bean

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

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

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