emigrant vs incomer

emigrant

noun
  • Someone who leaves a country to settle in a new country. 

  • Any of various pierid butterflies of the genus Catopsilia. Also called a migrant. 

incomer

noun
  • An outsider who moves to a community or a place; (used by those who consider themselves to be its original inhabitants). 

  • One who comes in. 

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