Pronouns are words that replace nouns. Examples include:
* Personal pronouns: I, you, he, she, it, we, they
* Possessive pronouns: mine, yours, his, hers, its, ours, theirs
* Reflexive pronouns: myself, yourself, himself, herself, itself, ourselves, yourselves, themselves
"Set" is a noun (a group of things), a verb (to put something in a place), or an adjective (fixed or arranged).
Let me know if you have any more questions about pronouns!