1.Noun

2. Pronoun

3. Adjective

4. Verb

5. Adverb

6. Preposition

7. Conjuction

8. Interjection

Short Definition

1.Noun :-  Naming Word

2. Pronoun :- Replaces a Noun

3. Adjective :- Qualifies a noun / a pronoun

4. Verb :- Action

5. Adverb :- Qualifies a Verb

6. Preposition :-  Relating word

7. Conjuction :- Connecting word

8. Interjection :- Sudden Feeling , Expressing word .