It seems to me that in order to figure out who Gothmog could have been you have to answer the question as to why he would have taken the name Gothmog. If it was a Nazgul, surely you wouldn't have to make yourself sound more powerful by taking a name like that? For an orc, or perhaps a Black Numenorean, taking a name such as Gothmog for the reason of sounding more powerful sounds more plausible. However, why would an orc be in command at the Pelennor? Sauron had more powerful servants than an orc to take command. I can't think of a reason for a Nazgul to take the name Gothmog though. Unless JRRT just wanted to give the commander a name? For the position of having command a Nazgul seems most likely so I guess my opinion is that Gothmog is a Nazgul.
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