Word for entity baskets?

Question

Is there a word that is parent to "entity" and not on lines of "kind" or "all entities"?

Example: I have three "kinds" of entities, "forum", "topic", and "post".

I store them in a large area called "entities" as well which is confusing the heck out of me. I needed a different name.

entities: <<<<<<<< I need a better word here
    forumEntities:  entity1, entity2, entity3,
    topicsEntities: entity1, entity2, entity3,
    postsEntities:  entity1, entity2, entity3

So really the word I'm looking for is something to mean "all entity groups" or "various entity groups" or "entity baskets" or "entity branch".

I was thinking maybe worst case change the word entity to "stuff" then be like "stuffings > (stuffing === stuffs) > stuff"

stuffings:
    forumStuffs: stuff1, stuff2, stuff3
    topicStuffs: stuff1, stuff2, stuff3
    postStuffs:  stuff1, stuff2, stuff3

If you have any ideas better then "stuff" i'm all for abandoning the word "entity". Here is another I thought of, "entita" which is not a real word, I go the idea from the animal kingdom, phyla, phylum etc:

entitas:
    formEntita == forumEntitys: entity1, entity2, entity3

Answer 1

I'm adding this as an answer so it stops showing up in the "Unanswered" queue. The correct answer is above in the comments:

Thanks @RupertMorrish I think I'm going to do entitas > entita === entitys > entity. I got the idea from the animal kingdom, phyla, and organisms haha. – Noitidart Nov 3 at 7:45