supergroup

noun

1. Any group composed of other groups.

   “Near-synonyms: superset (often synonymous), superclass, supercategory”

2. Any group composed of other groups.

   “Formally, a supergroup is a more general notion than group. We illustrate the difference between the two notions by a simple example.”

3. Any group composed of other groups.

   “In 1974, David Geffen, Asylum's main man, applied his negotiating abilities to creating a country-rock supergroup along the lines of Crosby, Stills & Nash.”

   “A supergroup is a rock and pop music term for a group whose members are already successful and well known, either as solo performers or part of other groups. It was first applied in 1968, to Cream, whose three members had already achieved prominence, […]”

4. Any group composed of other groups.
5. Any group composed of other groups.
6. Any group composed of other groups.