Nouveau riche and Upper crust

Nouveau riche noun - One who has recently acquired wealth and social position.

Upper crust and nouveau riche are semantically related. In some cases you can use "Upper crust" instead a noun phrase "Nouveau riche".

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

Nouveau riche and upper crust are semantically related. Sometimes you can use "Nouveau riche" instead a noun phrase "Upper crust".