Elite group and Upper crust

Elite group noun - A group or class of persons enjoying superior intellectual or social or economic status.

Upper crust and elite group are semantically related. In some cases you can use "Upper crust" instead a noun phrase "Elite group".

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

Elite group and upper crust are semantically related. Sometimes you can replace phrase "Elite group" with "Upper crust", this phrases are similar.