topper
🇺🇸
/ˈtɑːpər/
🇬🇧
/ˈtɒpə(r)/
A hat that is tall and often black or gray, worn by men with formal clothing for very fancy events.
He wore a top hat and tails to the royal wedding, looking every inch the gentleman.
A person who scores the highest marks in a class.
She was the topper of the class, always scoring the highest marks in all subjects.