Part of speech.

They are eight in number.
And they are Noun Pronoun Adjective Verb Adverb Preposition Conjunction Interjection.
The of a Person Place or Thing _ Noun. Example Dasaratha king Country.
b] The word used in place [or] instead of a noun _ pronoun.
Example_ Dasaratha_ He, King_He, Country_ It.
c] The word adding something to the noun_ Adjective
Example_ Wise king, Fertile country, Interesting story.
d] The word used to something about some person place [or] thing_action word is verb.
Example_ Dasaratha ruled Kosala kingdom.You are very kind. He can do that.
A word used to add something to the verb adjective.
[or] Another adverb [modifying the verb] _ ADVERB.
Ram walked fast. This fruit is very sweet. You did that nicely
A word used to show the noun or pronoun in relation to something else PREPOSITION.
You are in the class room. The pen is made of plastic.The chair is near the table.
A word used to join word [or] sentences CONJUNCTION.
Sachin and Ganguly are good friends.
He prepared well but he didn't attend the examination.
You and I are now studying grammar.
a word which expresses a sudden feeling [or] emotion INTERJECTION.
Atlas ! they last the match.Ah! what a fine catch. Vow!That's very nice.