Orpg
Open Role Playing Game as referred to by Warcraft 3. It's a RPG that has a saving and loading feature.
Dude I love this Orpg Twillight Eve. I load my assassin and fuck everyone up!
ORPG
Online Role Playing Game, normally just an online RPG, no MM (mass multi player) element.
A good example would be Vitalise games made with click team products, non come to mind as I write this.