A noun is a word that represents a person, place, thing, or idea.

Common nouns and proper nouns.

A common noun is a general name for a person, place, or thing (e.g., 'city', 'dog').

A proper noun is a specific name for a particular person, place, or thing (e.g., 'New York', 'Fido').

An abstract noun is a type of noun that represents an idea, quality, or state rather than a concrete object (e.g., 'love', 'happiness').

A collective noun is a word that represents a group of people or things (e.g., 'team', 'flock').

The plural form of 'child' is 'children'.

The plural form of 'mouse' is 'mice'.

The plural form of 'tooth' is 'teeth'.

The plural form of 'bench' is 'benches'.