Definition: A Noun is a name. It can be a name of a person ,place or a thing. Literally saying, the doer of an action is a Noun.
Types of Noun:
1. Common Noun
2. Proper Noun
3. Collective Noun
4. Abstract Noun
Example: 1. Usha is a good girl.
2. Moorthy is playing cricket.
Here, in the above examples, an action or an quality is specified in which the doer of the action is the Noun. So, Usha and Moorthy are nouns respectively.