roaming vs travelling

roaming

noun
  • An instance of wandering. 

  • Using the OS service of manipulating folders and documents from different PC devices by a registered user. 

  • The use of a network or service from different locations or devices. 

  • The ability to use a cell phone outside of its original registering zone. 

travelling

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

adj
  • That travels (with one) 

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