First-class and Upscale

First-class adjective - Of the very best kind.

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

Upscale adjective - Appealing to affluent consumers.

First-class and upscale are semantically related. Sometimes you can use "First-class" instead an adjective "Upscale".