intro vs invite

intro

verb
  • To introduce. 

noun
  • The opening sequence at beginning of a film, television program, etc. 

  • An introduction. 

  • A small demo produced to promote one's demogroup or for a competition. 

invite

verb
  • To encourage. 

  • To ask for the presence or participation of someone or something. 

  • To allure; to draw to; to tempt to come; to induce by pleasure or hope; to attract. 

  • To request formally. 

noun
  • An invitation. 

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