Noun:
A noun names a person, thing, place, or an idea. It is the subject or object of a sentence. In the following sentence, the words “sister” (subject) and “zoo” (object) are nouns.

My sister went to the zoo.
Pronoun:
A pronoun takes place of a noun. It can be singular (I, me, you, he, him, she, her, it) or plural (we, us, you, they, them). It is the subject or object of a sentence. The second sentence below takes place of the noun in the first sentence.

Mark went to the zoo. He liked it.
Verb:
A verb shows action in a sentence. It tells what the noun does. In the following sentence, the verb tells about the noun’s action.

Mark went to the zoo.
Adjective:
An adjective is a word that describes a noun. It tells about how many or what kind of something. In the following sentence, the word “dark” describes the noun “door.”

Mark went to the zoo through the dark door.
Adverb:
An adverb is a word that describes a verb. It tells about how, when, or where. Many adverbs end in –ly (and tell about how). In the following sentence, the three adverbs tell how, where, and when Mark goes.

Mark quickly went outside last night.