preface vs prelims

preface

noun
  • The beginning or introductory portion that comes before the main text of a document or book. 

  • An introduction, or series of preliminary remarks. 

  • A title or epithet. 

  • The prelude or introduction to the canon of the Mass. 

verb
  • To give a preface to. 

  • To introduce or make a comment before (the main point). 

prelims

noun
  • The preliminary front matter of a book, i.e. all content preceding the main text or work itself. 

  • Preliminary examinations taken as a whole, as sat by an individual or year group. 

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