flour vs yolk

flour

noun
  • Powder of other material. 

  • Powder obtained by grinding or milling cereal grains, especially wheat, or other foodstuffs such as soybeans and potatoes, and used to bake bread, cakes, and pastry. 

  • The food made by grinding and bolting cleaned wheat (not durum or red durum) until it meets specified levels of fineness, dryness, and freedom from bran and germ, also containing any of certain enzymes, ascorbic acid, and certain bleaching agents. 

  • Coordinate term: meal 

verb
  • To reduce to flour. 

  • To apply flour to something; to cover with flour. 

  • To break up into fine globules of mercury in the amalgamation process. 

yolk

noun
  • The grease in a sheep's fleece; lanolin. 

  • The yellow, spherical part of an egg that is surrounded by the white albumen, and serves as nutriment for the growing young. 

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