However, you could use some options depending on the context:
* A system of moons: This is a more technical term, suitable for astronomical discussions.
* A cluster of moons: This emphasizes the grouping together of moons.
* A family of moons: This suggests a connection or shared origin of the moons.
* A retinue of moons: This is a more poetic option, emphasizing the moons as companions to a planet.
Ultimately, the best choice depends on the specific context and the impression you want to create.