Alien
Part of speech: adjective
Definition: Pertaining to an alien. Very unfamiliar, strange, or removed.
Part of speech: noun
Definition: A person, animal, plant or other thing which is from outside the family, group, organization, or territory under consideration. A foreigner residing in a country. Any life form of extraterrestrial origin.
Part of speech: verb
Definition: To estrange; to alienate.
Example sentence: Let us never forget that government is ourselves and not an alien power over us. The ultimate rulers of our democracy are not a President and senators and congressmen and government officials, but the voters of this country.
Exotic
Part of speech: adjective
Definition: Foreign, with the connotation of excitingly foreign.Non-native to the ecosystem.
Part of speech: noun
Definition: An organism that is exotic to an environment.An exotic dancer; a stripteaser.
Example sentence: I'm interested in finding whether or not there is a really massive, what we like to call 'super massive' black hole at the center of our galaxy. And the reason this is interesting is that it gives us an opportunity to prove whether or not these exotic objects really exist.