At once and Upscale

At once adverb - Without delay or hesitation; with no time intervening.

Upscale and at once are semantically related. In some cases you can use "Upscale" instead an adjective phrase "At once".

Upscale adjective - Appealing to affluent consumers.

At once and upscale are semantically related. Sometimes you can use "At once" instead an adjective "Upscale".