breakfast cereal vs porridge

breakfast cereal

noun
  • A food made from processed grains, such as maize, oats, wheat or rice, usually eaten for breakfast with milk and sometimes sugar. 

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 breakfast cereal and porridge occurred in a corpus of books? (source: Google Ngram Viewer )