tourism vs voyaging

tourism

noun
  • The act of travelling or sightseeing, particularly away from one's home. 

  • The industry in which such travels and sightseeing are organized. 

  • The act of visiting another region or jurisdiction for a particular purpose. 

voyaging

noun
  • Act of travelling or going on a voyage. 

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