appendix vs enlargement

appendix

noun
  • Any process, prolongation, or projection. 

  • A text added to the end of a book or an article, containing additional information. 

  • The vermiform appendix. 

enlargement

noun
  • An act or instance of making something larger. 

  • Diffuseness of speech or writing; a speaking at length. 

  • A making more obvious or serious; exacerbation. 

  • An image, particularly a photograph, that has been enlarged. 

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