barley vs buckwheat

barley

noun
  • A cereal of the species Hordeum vulgare, or its grains, often used as food or to make beer and other malted drinks. 

  • seed of Job's tears (Coix lacryma-jobi) 

buckwheat

noun
  • The fruit of this plant used as a pseudocereal. 

  • Any of the wild buckwheats in the genus Eriogonum. 

  • An Asian plant, of the species Fagopyrum esculentum. 

  • A slow and painful murder by the Mafia as a warning to others. 

  • Curly hair of a black person. 

  • Pubic hair. 

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