I've always thought that he was a man (similar to the Mouth of Sauron) or an orc.
The former is my real guess. As mentioned previously, it seems likely that an orc is not of such status or in charge of a human army.
The fact that Gothmog is not referred to as a Nazgul is enough for me to decide that he is not.
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...take counsel with thyself, and remember who and what thou art.
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