Undivided and Upper crust

Undivided adjective - Not divided or scattered among several areas of interest or concern.

Upper crust and undivided are semantically related. In some cases you can use "Upper crust" instead an adjective "Undivided".

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

Undivided and upper crust are semantically related. Sometimes you can use "Undivided" instead an adjective phrase "Upper crust".