noun clauses are clauses that act like nouns. There are two main types: those formed from statements, beginning with that; and those formed from questions, beginning with a question word such as how, what, which, why, etc
A dependent clause that can occur in the same place as a noun, pronoun or noun phrase in a sentence. Noun clauses begin with wh- words, if, whether, or that e.g. I don't know where Ellen is. I wonder if you can come tomorrow. I think that it"s a lie.