Collective nouns are terms used to describe a group of animals, objects, or people. They can refer to groups of animals like a pride of lions, a herd of elephants, or a flock of geese. Collective nouns can also describe groups of objects or things like a prickle of hedgehogs or a school of fish. Some common collective nouns include an army for soldiers, a crowd for people, a team for athletes, and a class for students.