migrant vs migrator

migrant

noun
  • A migratory animal, in particular a migratory bird. 

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

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

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

adj
  • Migratory. 

migrator

noun
  • Any creature that migrates. 

  • A computer program that helps move objects between locations, e.g. from a legacy system to a new technology. 

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