NOUN - name a person, place, thing or idea (friend, John, monkey...)
PRONOUN - take a noun's place (he, it, you, they..)
ADJECTIVE - describe a noun or pronoun (nice, yellow, smart)
VERB - describe an action or a state (think, guess, eat...)
ADVERB - describe a verb, adjective or adverb (sunny, always, happily)
PREPOSITION - show a relationship of place, time, location or direction between words (in, on, over, at, to)
CONJUNCTION - connect words, phrases and clauses (because, so, and, when, if)
INTERJECTION - tell emotion or surprise (oops, wow, oh no)
ARTICLES - introduce nouns (a, an, the).