Possibly. There is a chance that it could have been another Black Numenorean like the Mouth of Sauron, or even an orc or maybe something else... But a lot of people think that it was one of the Nazgul. In fact I used to believe this, until I looked at the pros and cons, like what the Nazgul were being used for at this point in time in contrast to what they had been used for in the past. It is a toss up, but I think it weighs more in favor of the Nazgul not being Gothmog.
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