What kind of clause is, whenever he has time.

1. Noun

2. Adverb

3. Adjective

The subordinate clause, "whenever he has time", is an example of a noun clause. A noun clause is a type of subordinate clause that is introduced by words such as who, whom, whomever, whenever, when, how, whether, which, why, where, whatever and what. A noun clause functions as a noun and can also function as a subject, direct object, object of a preposition, predicate nominative and indirect object.