Fortress
From Wookieepedia, the Star Wars wiki.
The term fortress could be used to refer to a fort of the kind used by lower-end technological civilizations. More often, however, it was used to describe a heavily armored ground installation built on a battlefield or strategic location to act as a command center or palace. Some fortresses were used by the Separatist leader Nute Gunray during the Clone Wars on planets like Cato Neimoidia and other worlds.
Darth Vader had a fortress on Vjun called Bast Castle.
