noun (n)

• a person who comes from a foreign country; someone who does not owe allegiance to your country(noun.person)

  Synonym:
  alien, noncitizen, outlander
  Antonym:
  citizen
  

  source: wordnet30
• someone who is excluded from or is not a member of a group(noun.person)

  Synonym:
  outsider
  

  source: wordnet30
• A person belonging to or owning allegiance to a foreign country; one not native in the country or jurisdiction under consideration, or not naturalized there; an alien; a stranger.(noun)

  source: webster1913