Noun is a word that describes a name, place or thing.
Pronoun replaces noun when noun it to be used for multiple times.
Verb is a word that describes the action.
Adverb is a word that describes a verb, adjective or an adverb.
Adjective is a word that describes a noun.
Preposition is a word that describes the relation of the noun with rest of the sentence.
Conjunction is a word that joins two parts of a sentence.
Interjection is a word that describes emotions.