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Noun Clause—A clause used as a noun.

Noun Clause as object: He said that I was mistaken.

In the sentence, Whom she means, I do not know, the relative clause is, whom she means, and is a noun clause forming the object of the verb know.

Noun Clause as subject: That I am here is true.

Use but that when but is a conjunction and that introduces a noun clause; as, There is no doubt but that he will go.