Upper class and Wealthy people

Upper class noun - The highest class in a society.

Wealthy people and upper class are semantically related in wealthy fashionable people topic. In some cases you can use "Wealthy people" instead a noun phrase "Upper class".

Upper class and wealthy people are semantically related in high society topic. You can use "Upper class" instead a noun phrase "Wealthy people", if it concerns topics such as wealthy fashionable people.