De luxe and Upper-class

De luxe adjective - Elegant and sumptuous.

Upper-class and de luxe are semantically related. in first-class topic. In some cases you can use "Upper-class" instead an adjective phrase "De luxe".

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

De luxe and upper-class are semantically related. Sometimes you can replace phrase "De luxe" with "Upper-class", this phrases are similar.