The word "stunner" is a noun that has a couple of different meanings. Let's break it down in a simple way:
An Unexpected and Amazing Event: A "stunner" can refer to something surprising and impressive that happens. For example, if a sports team wins a game when no one expected them to, that victory could be called a "stunner."
A Very Attractive Person: "Stunner" can also describe someone who is extremely beautiful or handsome. For example, if someone walks into a room and everyone notices how good-looking they are, you might say, "She is a real stunner!"
"Stunner" is a versatile word that can describe an amazing event or an exceptionally attractive person.