oatmeal vs rolled oats

oatmeal

noun
  • Meal made from rolled or round oats. 

  • A light greyish brown colour, like that of oatmeal. 

  • A breakfast cereal made from rolled oats, cooked in milk and/or water. 

adj
  • Of a light greyish brown colour, like that of oatmeal 

rolled oats

noun
  • Oat groats that have been rolled into flat flakes under heavy rollers. 

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