Noun is a word used to identify a person, object or a place or an idea.
Example 1- Ronaldo is my best friend. In this sentence, Ronaldo is the main noun as it is a person. Friend is also a noun. Example 2- London is my favourite city. Here, London is the main noun as it is the name of a place. City is also a noun.
A pronoun is a word which is used to replace a noun. Some pronouns are- He, She, I, My, It, etc. Example- Sentence with a noun: Ronaldo is my best friend. Sentence with a pronoun: He is my best friend.
An adverb is a word which describes a verb. Example- He walks quickly to the office. Here, the adverb is quickly as it describes how the verb is doing the action of walking.
A verb is a word which tells what a noun is doing.
Example- Remo likes to play football. Here, the verb is play as it tells what the subject- Remo is doing.
Adjective- An adjective is a word which describes the noun. It tells us attributes or features of the noun.
Example- Penguins are cute animals. In this sentence, cute is the adjective.