dissertation vs writing

dissertation

noun
  • A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree in the US and a non-doctoral degree in the UK; a thesis. 

  • A lengthy lecture on a subject; a treatise; a discourse; a sermon. 

writing

noun
  • 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. 

  • A work of an author. 

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