annotation vs doctoral thesis

annotation

noun
  • The process of writing such comment or commentary. 

  • Information relating to the genetic structure of sequences of bases. 

  • A critical or explanatory commentary or analysis. 

  • Metadata added to a document or program. 

  • A comment added to a text. 

doctoral thesis

noun
  • A research paper that a student writes in order to complete the requirements for a doctorate; a dissertation. 

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