tract vs writing

tract

noun
  • A brief treatise or discourse on a subject. 

  • Part of the proper of the liturgical celebration of the Eucharist for many Christian denominations, used instead of the alleluia during Lenten or pre-Lenten seasons, in a Requiem Mass, and on a few other penitential occasions. 

  • A series of connected body organs, such as the digestive tract. 

  • A commentator's view or perspective on a subject. 

  • Continued or protracted duration, length, extent 

  • An area or expanse. 

  • A small booklet such as a pamphlet, often for promotional or informational uses. 

writing

noun
  • A work of an author. 

  • Something written, such as a document, article or book. 

  • The process of representing a language with symbols or letters. 

  • The style of writing of a person. 

  • Intended for or used in writing. 

  • Graphism of symbols such as letters that express some meaning. 

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