coalition vs concordat

coalition

noun
  • A temporary group or union of organizations, usually formed for a particular advantage. 

  • The collective noun for a group of cheetahs. 

concordat

noun
  • A formal agreement between two parties, especially between a church and a state; specifically, an agreement between the Pope and a government. 

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