bran vs integument

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. 

integument

noun
  • The outer layer of an ovule, which develops into the seed coat. 

  • An outer protective covering such as the feathers or skin of an animal, a rind or shell. 

  • A shell or other outer protective layer. 

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