congee vs oatbread

congee

noun
  • A type of thick rice porridge or soup, sometimes prepared with vegetables and/or meat. 

  • Leave, formal permission for some action, (originally and particularly) 

oatbread

noun
  • bread made with oatmeal 

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