I'm looking for a pair of words that essentially means "super-collection" and "collection" where the super-collection contains a set of collections. (Alternatively, could be thought of as a "collection" which contains a set of "sub-collections".) I want the words to NOT use either "super" or "sub". I'm open to general English or jargon from specific domains.
Ok, we've got five _<collections>_ – let's group them together into a _<super-collection>_.