Is fun a predicate noun

The noun 'fun' can be a predicate noun.

A noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.

A predicate noun (also called a predicate nominative or subject complement) is a noun or pronoun that restates the subject following a linking verb.

A linking verb acts as an equals sign, the object is or becomes a form of the subject. A linking verb is used to restate or describe the subject.

Examples:

Skating is fun. (skating = fun)

The rides at the fair were fun. (rides = fun)

The meeting turned out to be fun. (meeting = fun)