rough sleeper vs wanderer

rough sleeper

noun
  • A homeless person who sleeps outdoors. 

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 rough sleeper and wanderer occurred in a corpus of books? (source: Google Ngram Viewer )