noun definition grammar
GRAMMAR. A noun is a part of speech that is used to name a person, place, thing, quality, or action. A noun can function as a subject, object, complement, appositive, or object of a preposition.Nouns can be singular or plural.The plural form of a noun is usually formed by adding s at the end of the noun. noun is a part of speech that is used to name a person, place, thing, quality, or action. A noun can function as a subject, object, complement, appositive, or object of a preposition. Nouns can be singular or plural.