What is the noun clause of whatever?

"Whatever" itself isn't a noun clause. It's a pronoun, specifically an indefinite pronoun that can act as a subject, object, or even a possessive.

To make a noun clause with "whatever," you need to add a verb and perhaps other elements to complete the thought. For example:

* Whatever you do is your business. ("Whatever you do" is the noun clause acting as the subject of the sentence.)

* I'll eat whatever you cook. ("Whatever you cook" is the noun clause acting as the object of the verb "eat".)

* I'll buy you whatever you want. ("Whatever you want" is the noun clause acting as the object of the preposition "for.")

Therefore, "whatever" on its own isn't a noun clause, but it can be part of a noun clause.