* Preposition: A word that shows the relationship between a noun or pronoun and another word in the sentence. Examples: on, in, at, to, from, by, with, for.
* Pronoun: A word that replaces a noun or noun phrase. Examples: I, you, he, she, it, we, they, me, him, her, them.
* Proper noun: A noun that refers to a specific person, place, or thing. Examples: John, London, The Eiffel Tower.