My point was not to prove that the Nazgul could harm people. It was that it was mostly in the fear of them hurting you that did the damage. The same can be said with the dead men.
I would have to say The Silmarils, Grond and Angainor. But if it came to what weapon was worth the most I'd have to say Ringil, Fingolfin's sword. I say that because he did wound Morgoth with it.
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... and he drew his sword Ringil, that glittered like ice.
Yet Gurthang did actually slay Glaurung besides countless other fell creatures. Plus he did most likely slay Morgoth with it at the end of Days, though I won't get into that...
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Utúlie'n aurë! Aiya Eldalië ar Atanatári, utúlie'n aurë! Auta i lómë! Aurë entuluva!