According to UNO, from a tweet that continues to resurface every few years ... if you attempt to stack a draw-2 on top of a draw-4, you’re playing the game wrong, tantamount [ˈtæntəˌmaʊnt] to cheating. I scoff at such foolishness.

tantamount
adj [ˈtæntəˌmaʊnt]

Tantamount means “equivalent in value, significance, or effect.” It is sometimes confused with paramount, which does not describe something that is equivalent, but instead means “superior to all others.”

Although tantamount (from the Anglo-French phrase tant amunter, meaning “to amount to as much”) was used three different ways in the early 17th century—as a noun, verb, and adjective—the adjective form has since proven paramount/supreme to English users

English