emigrant vs evacuee

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. 

evacuee

noun
  • A person who has been evacuated, especially a civilian evacuated from a dangerous place in time of war 

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