I have a series of items that I need to categorize. However, I would like to convey in a word that each item should really only belong to one specific category or group. Because of this intended mutual exclusivity, using the word "category" or the word "group" seems insufficient.
For example, imagine I had these items:
Blue Orange Soda Basketball Green Football Coffee
Possible values for acceptable 'group' names would be:
Color Beverage Sports
If I were to say, "To which group does 'Basketball' belong?", it's possible someone would respond by using both Sports and Color, since a basketball is orange. Words such as "bucket" or "bin" have been suggested as the implicit physical limitations of those items would help someone infer that an item can only belong to one. These seem like a good alternative.
Are there any words that are more explicit about the one-to-one nature of the grouping?