Indeed, they are one and the same. "Nazgul" means "Ring-wraith" in the Black Speech. Nazgul are Ringwraiths whether with or without their fell beasts (which is, I believe the only name given to their winged mounts).
After all, the Witch-King is referred to as the Lord of the Nazgul. And I don't see him as being a fell beast. [img]smilies/biggrin.gif[/img]
In LotR, it seems that the Ringwraiths come to be referred to as the Nazgul (as opposed to Black Riders) after they have taken to the skies on their fell beasts. Which, I believe, accounts for the reference to one of the Nazgul as a "winged terror". The Nazgul is winged in the sense that it is riding a creature with wings.
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Do you mind? I'm busy doing the fishstick. It's a very delicate state of mind!
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