alien
incomer
newcomer
stranger
Answer is Right!
Answer is Wrong!
The correct answer is alien.
An alien is a person who is not a citizen of a particular country. An incomer is a person who moves into a particular place, especially from another country. A newcomer is a person who has recently arrived in a place. A stranger is a person whom one does not know or has not met before.
Of these, only alien is the opposite of native. A native is a person who was born in a particular place and belongs to that place. An alien is a person who is not a native of a particular place.