displaced person vs migrant

displaced person

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

migrant

noun
  • Traveller or worker who moves from one region or country to another. 

  • A person who leaves one place in order to permanently settle in another. 

  • A migratory animal, in particular a migratory bird. 

  • Any of various pierid butterflies of the genus Catopsilia. Also called an emigrant. 

adj
  • Migratory. 

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