oatmeal vs porridge

oatmeal

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

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

  • Meal made from rolled or round oats. 

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

porridge

noun
  • A dish made of grain or legumes, milk and/or water, heated and stirred until thick and typically eaten for breakfast. 

  • A prison sentence. 

  • Rice porridge; congee. 

  • Oatmeal porridge. 

  • A type of thick soup or stew, especially thickened with barley. 

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