expat vs wanderer

expat

noun
  • An expatriate; a person who lives outside their own country. 

wanderer

noun
  • One who wanders, who travels aimlessly. 

  • Any of various far-migrating nymphalid butterflies of the genus Danaus. 

  • The wandering albatross, Diomedea exulans. 

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