dissertation vs leaflet

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. 

leaflet

noun
  • A small sheet of paper containing information, used for dissemination of said information, often an advertisement. 

  • One of the components of a compound leaf. 

  • A flap of a valve of a heart or blood vessel. 

  • A small plant leaf. 

verb
  • To distribute leaflets to. 

  • To distribute leaflets. 

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