Well yes, but it seems to me that everything is a part of something greater and everything has a collective name. I'm interested in knowing where that rule ends. What is a group of super clusters? And then what is a group of those? And so on and so forth.
As Severian said, "The 'universe' is defined as everything there is, so if there is something beyond what we currently the call 'the universe' we would have to relable this as the universe instead." and that is a very good point. I'm just interested in knowing where the groups of groups end and the imaginary boundaries of the universe begins.