alien

[1]	alienate
[2]	estrange , alienate , disaffect

[1]	foreigner , noncitizen , outlander
[2]	stranger , foreigner , stranger , unknown , outlander , outsider , non-native , immigrant , newcomer
[3]	extraterrestrial being , extraterrestrial

adj.

[1]	foreign , strange , exotic , outlandish , unfamiliar
[2]	foreign
[3]	exotic