A group of cats is referred to as a clowder or a glaring. An unneutered male cat is called a tom (or a gib, if neutered) and an unneutered female cat is called a queen.
"Of all the [cat] toys available, none is better designed than the owner himself. A large multipurpose plaything, its parts can be made to move in almost any direction. It comes completely assembled, and it makes a noise when you jump on it."
Stephen Baker