bran vs wheat flour

bran

noun
  • The broken coat of the seed of wheat, rye, or other cereal grain, separated from the flour or meal by sifting or bolting; the coarse, chaffy part of ground grain. 

  • The European carrion crow. 

wheat flour

noun
  • Flour made from wheat. 

  • exact synonym of flour 

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