[Lostgaeriel]

First of all, can a mature male hobbit be called a man?

Lolidir wrote:

bc i would consider Merry a man, wouldnt you? some may say no he was a Hobbit

Let's go to a good source on this question:

'I will vouch for him before the seat of Denethor,' said Gandalf. 'And as for valour, that cannot be computed by stature. He has passed through more battles and perils than you have, Ingold, though you be twice his height; and he comes now from the storming of Isengard, of which we bear tidings, and great weariness is on him, or I would wake him. His name is Peregrim, a very valiant man.'

'Man?' said Ingold dubiously, and the others laughed.

'Man!' cried Pippin, now thoroughly roused. 'Man! Indeed not! I am a hobbit and no more valiant than I am a man, save perhaps now and again by necessity. Do not let Gandlaf deceive you!'

If a hobbit says that a hobbit is not a man, then I think that question is settled.

This is of course the reason why we debate whose blow actually killed/destroyed the Witch King - Eowyn's or Merry's. (But that is discussed on another thread.)

But back to the initial question posed by Feanor of the Peredhil which I think I can paraphrase as 'Could the Witch King have been killed by an unliving man or unliving woman?’.

Note that Glorfindel does not include the adjective 'living' in the following excerpt from Appendix A, Annals of the Kings and Rulers; I, The Númenorean Kings; (iv) Gondor and the Heirs of Anarion (just before The Stewards section):

’Eärnur now rode back, but Glorfindel, looking into the gathering dark, said: “Do not pursue him! He will not return to this land. Far off yet is his doom, and not by the hand of man will he fall.” These words many remembered; but Eärnur was angry desiring only to be avenged for his disgrace.

So, 'Could the Witch King have been killed by an unliving man or unliving woman?’
is not relevant to the actual 'prophecy' by Glorfindel. Sorry about that. (I really didn't know what my conclusion was going to be until I searched through the quotes.)