compendium vs treatise

compendium

noun
  • A short, complete summary; an abstract. 

  • A collection of board games packaged in a single box. 

  • A collected body of information on the standards of strength, purity, and quality of drugs. 

  • A list or collection of various items. 

treatise

noun
  • A formal, usually lengthy, systematic discourse on some subject. 

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