A noun is a word used to represent a person, place, or thing. For example,

Broadly, nouns are classified into two types, named countable (which can be counted) and uncountable noun (which cannot be counted). A countable noun is further classified into proper, common and collective nouns whereas uncountable nouns are material and abstract nouns. It is the name of some particular person, place, thing or animal. In most cases, proper noun begins with a capital letter. For example, A common noun is a name that represents a person, place, or thing usually in a general sense. A common noun does not require capitalization, but capitalization is required when a sentence begins with it. For example, A collective noun is the name of a group of persons or a collection of things taken as a whole. In most cases, the collective noun is used as a singular. If it is used as a plural it becomes a common noun. For example, A material noun is the name of a material or substance from which things are made of. A material noun is also called an uncountable noun because it cannot be counted. It can be only measured and weighted. For example, Mostly, material nouns are used in the singular form and articles not used before it. The noun refers to something intangible or abstract things called abstract nouns. It describes something that cannot be seen, heard, touched, tasted, or smelled. It refers to action as state, quality, idea, art and concept. For example, Mostly, abstract nouns are used in the singular form.