wheat vs wheaten

wheat

noun
  • A light brown colour, like that of wheat. 

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

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

wheaten

noun
  • A pale yellow or beige colour, like that of wheat. 

adj
  • Of, pertaining to, or made from wheat. 

  • Of a pale yellow-beige colour, like that of wheat. 

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