wanderer vs zingaro

wanderer

noun
  • One who wanders, who travels aimlessly. 

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

  • The wandering albatross, Diomedea exulans. 

zingaro

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