outing vs travelling

outing

noun
  • A pleasure trip or excursion. 

  • A performance in public, for example in a drama, film, on a musical album, as a sports contestant etc. 

  • The practice of publicly revealing that a person is homosexual or transgender without that person's consent. 

travelling

noun
  • The act of one who travels; a journey. 

adj
  • That travels (with one) 

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