Noun is traditionally defined as the name of person, place or a thing but this definition lacks many things. When we say destruction and death too are noun they are neither person nor place nor thing. So the workable definition of noun is that the noun is the name. Any name is treated as noun as any work is treated as verb. There are billions of names so there are billions of nouns.
Pronoun is a word that is used in the place of noun, for example; I, we, you, they, he, she, it.
Ali is wise and He is wise. In the second example instead of Ali the word He is used thus He is the pronoun. We use pronouns very often.
Pronoun is divided into six groups. These groups are also called cases.
Adverb is the word which tells us about verb. It means that it modifies verb. Adverb also modifies Adjective.
Examples of adverb modifies verb
- He runs very fast. (Fast is the word that tells us about running)
- He works intelligently. (Intelligently is the word stands for the work)
- He answered quickly. (Quickly is the adjective that stands for answered)