alien \ˈā-lē-ən, ˈāl-yən\ a : belonging or relating to another person, place, or thing : strange an alien environmentb : relating, belonging, or owing allegiance to another country or government : foreign alien residentsc : exotic 1 alien plants
Gastarbeiter noun gastˌɑːbaitə,German ˈgastˌarbaitɐ /a person with temporary permission to work in another country, especially in Germany. "the Gastarbeiter who sustained the German economic miracle"