Part of Speech 

Each word has its sentence Performs some grammatical function. according to the work they do in a sentence, words are divided into eight different classes. 
    1. Noun  (संज्ञा )
    2. Pronoun ( सर्वनाम )
    3. Verb  (क्रिया )
    4. Adverb (क्रियाविशेषण )
    5. Adjective ( विशेषण )
    6. Preposition ( संबधसूचक  अव्यय )
    7. Conjunction (संयोजक अव्यय )
    8. Interjection . (विस्मयबोधक )
These  eight classes of words are called the part of speech. 

A Noun

A Noun is the name of person, place, thing or an idea.
e.g. Siri Rajiv Gandhi is your Prime Minister.
        Delhi is the capital of India. the noise woke up the baby.
       Virtue is its own reward. 
Person :Father, Mother, Brother, Teacher, Mohan Sohan.
Places: Delete India Bihar, Chandigarh, Bhiwani , Hisar.
Things: Book, train ,land ,table ,Bad.
Ideas : Grief ,Desire, Justice ,Democracy ,Friendship. 

1.Noun is the name of person place thing or idea

For example.
Sri Rajiv Gandhi is our Prime Minister. 
Delhi is the capital of India. 

2 A pronoun is a word used for a noun. It helps us to avoid the repetitions of now in the same piece of writing. e.g.

Ashok loves his stepmother but she does not like him. 
Where is my book?

3. An Adjective- An adjective is a word which modify or qualify a noun, that is, which add to the meaning of a noun or pronoun.

For example-
 Sachin is a brave boy. 
Gold is a precious metal. 
Anytime he’s an intelligent teacher. A, An, and The are addictive. They’re called particles. we shall discuss them separately.