immigrant vs migration

immigrant

noun
  • A non-native person who comes to a country from another country to permanently settle there. 

  • A plant or animal that establishes itself in an area where it previously did not exist. 

adj
  • Of or relating to immigrants or the act of immigrating. 

migration

noun
  • An instance of moving to live in another place for a while. 

  • Instance of changing a platform from an environment to another one. 

  • The movement of cells in particular directions to specific locations. 

  • Movement in general. 

  • Seasonal moving of animals, as mammals, birds or fish, especially between breeding and non-breeding areas. 

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