Home to some sort of squad/squadron capable of sortie
Relatively slow maneuvering
Has a name (example: Star Wars: The Rebellion force's Mon Calamari Cruiser Home One, and the Empire's Super Star Destroyer Executor)
The ship often has many of the following characteristics:
Commanded by an important/well-liked Admiral (Ackbar), General, or other officer
Exceptionally large
Dificult to destroy
Extremely well armed
Large crew
Self-Sufficient
Long-lived (usually good guys)(counterexample: Star Wars: Executor lasted 75% of one large scale battle, then a single A-wing crashed into its command bridge and it went splodie into the Second Death Star)
Short-lived (usually bad guys)(counterexample: Star Wars: Home One lasted through all of the Rebellion's campaign (a different Cruiser was pew pewed by the Second Death Star in Return of the Jedi))