small

(uncountable, especially clothing, food or drink) One of several common sizes to which an item may be manufactured.

(countable, especially clothing, food or drink) An item labelled or denoted as being that size.

(countable, especially with respect to clothing) One who fits an item of that size.

(countable, rare) Any part of something that is smaller or slimmer than the rest, now usually with anatomical reference to the back.