First-rate and Upper-class

First-rate adjective - Of the very best kind.

Upper-class and first-rate are semantically related. In some cases you can use "Upper-class" instead an adjective phrase "First-rate".

Upper-class adjective - Of high birth, rank, or station.

First-rate and upper-class are semantically related. Sometimes you can use "First-rate" instead an adjective phrase "Upper-class".