What is the name given to a collection of similar things or persons?

A noun is a part of speech in English grammar that refers to the name of a person, place, animal, idea, feeling, thing, etc. There are several types of Nouns. The most important ones are common nouns, proper nouns, abstract nouns, and concrete nouns. A group of related objects or people are referred to as collective nouns. Several examples include a fleet of ships, a flock of birds, etc.