foot passenger vs migrant

foot passenger

noun
  • A passenger on a ferry who does not have a car, or any other form of transport, with them. 

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 foot passenger and migrant occurred in a corpus of books? (source: Google Ngram Viewer )