At that point, the man who refused to obey pulled what appeared to be a handgun.
Is what appeared to be a handgun a noun phrase in the sentence above?
It is a content clause, also called a noun clause.
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fold navy 285Is what appeared to be a handgun a noun phrase in the sentence above?
Yes. As far as I know, all of those fused relative constructions that start with what are NPs except when they are interrogative content clauses: I didn't know what happened.
CJ