introduction vs startup

introduction

noun
  • The act or process of introducing. 

  • A written or oral explanation of what constitutes the basis of an issue. 

  • A means, such as a personal letter, of presenting one person to another. 

  • An initial section of a book or article, which introduces the subject material. 

startup

noun
  • The act or process of starting a process or machine. 

  • A new company or organization or business venture designed for rapid growth. 

  • A folder (especially in Windows), containing shortcuts of applications or programs that start up automatically after a user signs in. 

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