Clowder is a noun that refers to a group of cats. 

Coming from a Middle English word for ‘a mass’ or ‘a rock,’ our word of the day is used in the same way the word ‘pack’ is used to describe a gathering of wolves. Here’s an example of clowder in use:

That large clowder of cats outside made me a little uneasy at first, but there’s something about cats that just melt my heart even when they’re feral and trying to nip at your ankles.