system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why did they refer to the Death Star as a space station or battle station?

The Death Star:

- has sublight engines for maneuvering in system

- has hyperdrive capability

Why and how do they consider it a space station? It’s called a ‘mobile battle station’, but I don’t really see what that’s supposed to mean. 

If a space station has both sublight and FTL maneuverability, why not just call it a starship?
gpt
In Star Wars a "Battle Station" is defined as a large space craft whose power generation is primarily for combat purposes. If it's mobility is self powered, then one could slap "mobile" the front to better describe it. The death star, and even capital ships, fit into this category.

Also in Star Wars, "Space Station" is interchangeable with "Star Ship."