[Suzerain of Sheol]

Yoku, they certainly were Ringwraiths at that point, the Witch-King's wars against Arnor took place early in the Third Age, while the Nazgul first appeared in the late Second Age. My issue with the "resurrection" was with the entire idea that he would need to be woken up, as you put it, in the first place. The word works fine in the invented scenario they seem to be putting forth, but it's ridiculous in terms of both Tolkien-canon, and what's established about the wraiths in the other movies.

It *would* be nice, though, if it was a red herring and they really didn't understand the situation, but Galadriel sounded pretty confident when she was describing his tomb.