Ned, the forum title is fine as it stands.
While on the face of it they may seem very similar, in fact they are quite different experiences. Ashin is spot on with his description, and while I've played almost nothing of the MMO world, I'm aware of some fundamental differences. First and foremost is that the "RPG's" discussed here are single player - while there may be some online or multi-player aspects, they aren't MMO's as such. I think it's probably best summarised (in my mind) that RPG's are all about you, and you alone, where MMORPG's are about you interacting with a multitude of others.
RPG's can be very similar to games like WoW, or they can be similar to shooters (Fallout 3) - it's all about the choices faced by the player, and the fact that these decisions will have (hopefully) far reaching implications within the game. By having choices, you can decide for yourself if you want to be benign, or villanous, and there are generally jobs or quests to do - how and when you do them is generally up to you.
So this forum and it's title is spot on as far as I'm concerned.