RP = Role Playing
RPG = Role Playing Game
So they have the same meaning don't they? Please correct me if I'm wrong.
You're wrong. An RPG is a game with roleplaying elements, a roleplay is a roleplay. If you've ever had something like a drama class in junior high school or something, they tell you to "roleplay" a certain role in a skit. It's the same idea, you're just acting out a character. Not finding loot and getting epic gear.