caryopsis vs wheat

caryopsis

noun
  • A type of fruit in which the fruit skin is stuck to the seed coat; especially the grain of a cereal. 

wheat

noun
  • Any of several cereal grains, of the genus Triticum, that yields flour as used in bakery. 

  • A light brown colour, like that of wheat. 

adj
  • Wheaten, of a light brown colour, like that of wheat. 

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