Pilgrim vs displaced person

Pilgrim

noun
  • A settler of the Plymouth Colony. 

  • Someone connected with Plymouth Argyle Football Club, as a fan, player, coach etc. 

name
  • A surname. 

displaced person

noun
  • A refugee, especially of war or of forced migration. 

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