How exactly did the Nazgul die (I am guessing when the one ring was destroyed they died)?
It's a good question. I guess their life force was tied up with their rings which were controlled by the evil in the one ring, and from Sauron's will. When these were destroyed, there was nothing left to support them.
In ranking I imagine the Nazgul were similar to Aragorn or his predecessors, in that they were powerful lords of men, and the suggestion (if not the fact but I can't recall it) is that at least one has magical ability(for the want of a better term). So Gandalf would be a match for them, certainly one on one, but it would be a taxing duel for him.
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