There are eight main part of speech: noun, pronoun, verb, adverb, adjective, conjunctions, preposition and interjection.
noun is a name of person, place, things or ideas
pronoun is a replacement of noun
verb is an action or a state of being
adverb describe or modify the verb, adverb or adjective
adjective describe or modify noun or pronoun
conjunction connects the words, phrases or clauses
preposition shows the relationship between noun or pronoun
interjection is a spoken or written expression of emotion like "wow!"