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.

The Very Best Toy for Cats

"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

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