A noun is the word that refers to a person, thing or abstract idea. A noun can tell you who or what.
There are several different types of noun:-
There are common nouns such as dog, car, chair etc.
Nouns that refer to things which can be counted (can be singular or plural) are countable nouns.
Nouns that refer to some groups of countable nouns, substances, feelings and types of activity (can only be singular) are uncountable nouns.
Nouns that refer to a group of people or things are collective nouns.
Nouns that refer to people, organisations or places are proper nouns, only proper nouns are capitalised.
Nouns that are made up of two or more words are called compound nouns.
Nouns that are formed from a verb by adding -ing are called gerunds