Is "what he did yesterday" a fused relative? "what" is the fused relative. "what he did yesterday" is a fused relative clause (or construction).
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Amir OghlowWhat he did yesterday was terrible.Is "what he did yesterday" a fused relative?"what" is the fused relative.
Amir OghlowIs "what he did" a fused relative (clause) or a noun clause?Both. In traditional grammar it's a noun clause or noun phrase.