Noun

• S: (n) foreigner, alien, noncitizen, outlander (a person who comes from a foreign country; someone who does not owe allegiance to your country)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• antonym
• S: (n) stranger, alien, unknown (anyone who does not belong in the environment in which they are found)
• S: (n) extraterrestrial being, extraterrestrial, alien (a form of life assumed to exist outside the Earth or its atmosphere)

Verb

• S: (v) alien, alienate (transfer property or ownership) "The will aliened the property to the heirs"

Adjective

• S: (adj) alien, foreign (not contained in or deriving from the essential nature of something) "an economic theory alien to the spirit of capitalism"; "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature"
• S: (adj) alien, exotic (being or from or characteristic of another place or part of the world) "alien customs"; "exotic plants in a greenhouse"; "exotic cuisine"