Female Nazgûl???

[Lalwendë]

I'm thinking aloud here...

I was wondering about how many of the Nazgul could have originated from Numenor. It is said that three were Numenorean Lords, which makes a lot of sense. Men were gifted with Death by Eru, and many Numenoreans disliked this, so to tempt them with a ring offering eternal life would be more likely to result in their accepting the gift. If some of the Ringwraiths were "sorcerors", could they have also been Numenorean in origin? These could have been drawn from the ranks of those who were engaged in establishing and running temples in Numenor, which was seen as wrong. "Sorceror" certainly seems to be a pejorative term in Middle Earth, something much lower than a wizard, so it hints at figures who wished to have greater powers; such people would be likely to be tempted by one of the Rings too?

[Anguirel]

Not to mention Black Numenoreans, who openly worshipped Sauron, like the Mouth of Sauron and Herumor. I wonder if they would be included among the Numenorean Lords, though.