It comes from a BOOK which is cursed. All who try to translate its mysteries are doomed to scratch their heads forever over translation issues.
Joking aside, I always thought the whole incident with Alhazred and the Book of Condemnation had a very occultish theme to it. And the spells for the Condemnation rune have names which suit that sort of theme (black shiver.... dark summoning...)
Whereas S4 didn't have an occult feel to it. To me, Lazlo's struggle with the Rune of Punishment felt like we were witnessing the physical and emotional struggles that he and all the previous bearers have been through. There was also a feeling of hope about Lazlo's struggle because his friends agree to stand by him no matter how dangerous the rune is, and also when Lazlo meets Ted, another cursed rune bearer, you get to tell him that even though the rune has taken so much from you, you gain so much from it as well, such as the friendships that Lazlo forms and the gratitude of the people he is able to save by putting his own life at risk. And when you gather the 108 stars and achieve the Rune of Punishment's atonement phase, you're able to use its power without being harmed by it. Forgiving Snowe and reconciling with him means Lazlo is able to overcome that dark sh!t he has been through and live safely with his power in check.
The Condemnation rune doesn't come with any of that forgiveness or atonement stuff, it just contains the destructive properties of the Rune of Punishment. There's no healing spell.
There's also the part where Eurum opens the book and becomes trapped in a fantasy where he is surrounded by beautiful princesses and the book/rune is draining him. The Rune of Punishment didn't seduce you with sweet dreams, it caused you to experience the painful memories of its previous owners.
I'm not quite sure what I'm getting at here, but maybe the writers chose different spell names because the Condemnation rune only contains the ROP's dark and destructive properties and decided on names that sound darker and more ominous. It would be interesting if there is some sort of back story to the whole Book of Condemnation and how it came to being.