What is a Noun?
A noun is a word used to name a person, animal, place, thing, and abstract idea. Nouns are usually the first words which small children learn. The highlighted words in the following sentences are all nouns:

1. Late last year our neighbours bought a goat.
2. Portia White was an opera singer.
3. The bus inspector looked at all the passengers' passes.
4. According to Plutarch, the library at Alexandria was destroyed in 48 B.C.
5. Philosophy is of little comfort to the starving.

A noun can function in a sentence as a subject, a direct object, an indirect object, a subject complement, an object complement, an appositive, an adjective or an adverb

__________________
With,
J. Jeyaseelan
Everything Possible

Types of Nouns
There are many different types of nouns. As you know, you capitalise some nouns, such as "Canada" or "Louise," and do not capitalise others, such as "badger" or "tree" (unless they appear at the beginning of a sentence).
In fact, grammarians have developed a whole series of noun types, including the proper noun, the common noun, the concrete noun, the abstract noun, the countable noun (also called the count noun), the non-countable noun (also called the mass noun), and the collective noun.

You should note that a noun will belong to more than one type: it will be proper or common, abstract or concrete, and countable or non-countable or collective.
If you are interested in the details of these different types, you can read about them in the following sections.

__________________
With,
J. Jeyaseelan
Everything Possible

What is a Pronoun?
A pronoun can replace a noun or another pronoun. You use pronouns like "he," "which," "none," and "you" to make your sentences less cumbersome and less repetitive.
Grammarians classify pronouns into several types, including the personal pronoun, the demonstrative pronoun, the interrogative pronoun, the indefinite pronoun, the relative pronoun, the reflexive pronoun, and the intensive pronoun.

__________________
With,
J. Jeyaseelan
Everything Possible