We have some different names for aliens, not like that we seen in Hollywood cinemas actually.
It might be contrary but if we think it logically there might be more similarity and example just like aliens. ...

Aliens meas powerful intelligent super humans extra extraterrestrial right...

Both Devatas Suras Asuras Gods are highly developed knowledge are from extraterrestrial super races they are not from Earth.

They visit Earth Via Vimana - Rathas which is written on scriptures....

Which is just like the same as taken in case of Aliens UFO.

Vishnu himself from Bikuntha - Bishulokas - Lokas means - Planets...

Which are most advanced and well equipped than Earth.

Like Brahma Loka, Bishnu Loka, Indra Loka , Etc.