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

[A]pproach thy grave / Like one that wraps the drapery of his couch / About him, and lies down to pleasant dreams.

We partied last night.

If they are not, they can easily be grasped by a study of a bathyorographical map. That will at once show that Scotland is divided—not very effectively— from the rest of Britain by the ridge of the Cheviots running north-east to south-west.