article vs treatise

article

noun
  • A part of speech that indicates, specifies and limits a noun (a, an, or the in English). In some languages the article may appear as an ending (e.g. definite article in Swedish) or there may be none (e.g. Russian, Pashto). 

  • A section of a legal document, bylaws, etc. or, in the plural, the entire document seen as a collection of these. 

  • A piece of nonfictional writing such as a story, report, opinion piece, or entry in a newspaper, magazine, journal, dictionary, encyclopedia, etc. 

  • A genuine article. 

  • A part or segment of something joined to other parts, or, in combination, forming a structured set. 

  • An object, a member of a group or class. 

verb
  • To bind by articles of apprenticeship. 

  • To formulate in articles; to set forth in distinct particulars. 

treatise

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

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