Ruling class and Upper crust

Ruling class noun - The class of people exerting power or authority.

Upper crust and ruling class are semantically related. in sophistication topic. In some cases you can use "Upper crust" instead a noun phrase "Ruling class", when it comes to topics like class below nobility.

Upper crust noun - Individuals carefully selected as being the best of a class.

Ruling class and upper crust are semantically related. You can use "Ruling class" instead a noun phrase "Upper crust".