A noun is a part of speech that serves as a subject or object. More generally, we think of a noun as a person, place, thing, quality, or action.

The word noun is noun, since a word is a thing. Tricky examples of nouns include gerunds: studying looks like a verb (and it is when you say "I'm studying for a test") but it's often a noun instead, as when you say, "Studying is very important." Sometimes a noun is missing but implied: When you tell your friend to "Go jump in a lake," the noun is you, as in "Hey, you, go jump in a lake."

Definitions of noun

n a content word that can be used to refer to a person, place, thing, quality, or action

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collective noun
a noun that is singular in form but refers to a group of people or things
mass noun
a noun that does not form plurals
count noun
a noun that forms plurals
generic noun
a noun that does not specify either masculine or feminine gender
proper name, proper noun
a noun that denotes a particular thing; usually capitalized
common noun
a noun that denotes any or all members of a class
deverbal noun, verbal noun
a noun that is derived from a verb
an adjective used as a noun
Type of:
content word, open-class word
a word to which an independent meaning can be assigned
any word or group of words functioning as a noun

n the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition

Type of:
major form class
any of the major parts of speech of traditional grammar