coalition vs collaboration

coalition

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

  • The collective noun for a group of cheetahs. 

collaboration

noun
  • The act of collaborating. 

  • Treasonous cooperation. 

  • A production or creation made by collaborating. 

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