Following my conversation with @Mark, clarifying what the synonym removal would signify, I understand what the issue is and support the synonym removal.
As it stands, World of Warcraft is a base game with in-game mechanics being altered with the release of each patch. As @Mark mentioned, the base game is granted to all players regardless of which expansion packs they have purchased. This includes major releases that are chronologically synchronized with expansion releases, but are not the expansion packs themselves. The expansion packs grant access to new content such as leveling zones, dungeons, raids, races, or classes. But things such as talent trees, rebuilt quest lines, and even pet battles are actually built into the base game of WoW and not actually connected to the expansion.
The point being made is that wow-cataclysm and world-of-warcraft are not the same thing. A question about Mages is not necessarily a question about wow-cataclysm, but a question about Dragon Soul is.
The importance of this is made clear with the ongoing Mists of Pandaria contest. While this may seem trivial when all questions will be effectively regarding the same "version" of WoW, this is currently not the case. Not all questions tagged world-of-warcraft will be regarding Mists of Pandaria, causing an undesirable ambiguity.