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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
When the pre-patch for Cataclysm was released, the original Zul'Gurub raid was removed from the game and was eventually replaced with an updated dungeon version of the instance.
Source: https://gamerant.com/world-of-warcraft-how-unlock-zulgurub-secrets/