A noun clause is a group of words that acts like a noun in a sentence. It is a type of dependent clause, or subordinate clause, that contains a subject and a verb but does not express a complete thought.
Characteristics
A noun clause can be the subject, object, or complement in a sentence.
It is preceded by a subordinating conjunction.
It can be useful for adding details and reporting information from other sources.
It usually begins with a relative pronoun or subordinating conjunction.