what is word and what role does it play in language .

Word:- avoid is a meaningful group of letters, that is a word is that which one or meaning.
As:- man, boy, girl,this,cat, dog etc.

These words are divided into 8 part we called them part of speech.
Noun
pronoun
adjective
verbs
adverb
preposition
conjunction
interjection

Definitions
1. Noun :- noun is a name giving to anything living or nonliving,material or non material.
2. Pronoun :-A pronoun is a word which is used in place of a noun.
3. Adjective :- An adjective is a word that qualify a noun or a pronoun.
4. Verb :- A verb is a word which speaks of an action it happens or is done.
5. Adverb :- an adverb is a bird that qualifies any part of speech except of a noun or pronoun.
6. Preposition :- aap free position is a bird which is establishes are relation between two other words in a sentence.
7. Conjunction:- The conjunction is a word that joins together other words, phrases, idioms and clause in a sentence.
8. Intrjection :- An interjection the word that we utter involuntary are called interjection.