Question

Defination of noun and pronoun

Answer 1

Nouns are the names of things, people, animals, places, qualities, actions, and ideas. They are usually single words, but not always. The words below are all nouns:
Cake ,
shoes ,
literacy,
school ,
bus ,
post-traumatic,
stress,
disorder

A noun phrase is a string of words, consisting of a noun plus any modifiers, that functions as a noun in a sentence. A noun phrase can act as a subject or an object. In the sentence below, "ten of her friends from college" is a noun phrase that acts as the object of the verb invited.

Rachel invited ten of her friends from college to her wedding.

 

Pronouns
A pronoun is a word that is used instead of a noun or noun phrase. Pronouns refer to nouns that have already been mentioned or are about to be mentioned.
For instance, in example 1, below, the pronoun she in the 2nd sentence refers to the noun phrase the school principal in the 1st sentence.
In example 2, he in the 1st clause refers to Nathan in the 2nd clause. 

Answer 2

$Simply$

Noun :
It iz a namin word of a place, person,thing and animal..

Pronoun :
It iz a word which iz used instead of a noun