common bean vs soybean

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. 

soybean

noun
  • The edible seed of this plant. 

  • A legume plant (Glycine max), commonly cultivated for human and animal consumption and as a nitrogen-fixing ground cover. 

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