Question

A clause used as the subject of a verb is called a(n).
adjective clause
adverb clause
noun clause
verb clause

Answer 1

Answer:

noun clause

Explanation:

A noun clause is a group of words acting together as a noun. Noun clauses can act as subjects, direct objects, indirect objects, predicate nominatives, or objects of a preposition.

Verb clauses, adjective clauses or adverb clauses do not act as subjects.  

Answer 2

noun clause

A noun clause is a subordinate clause that is used as a noun. Just like a noun, a noun clause may function as a subject in the sentence.  

For example, "Whoever correctly answers the question deserves a thank you."  

Whoever correctly answers the question is a noun clause used as the subject of the verb deserves.