First you have to say if you are talking about () the type or () the value. () the type is fairly close to void in meaning. () the value is fairly close to null in meaning. Thus both comparisons are accurate, which is applicable depends on which () you are referring to.

While your post is correct for () the type, if I consider () the value, your post could be transformed without loss of accuracy to:

Void is not a value either, and you cannot return it from a function. I think null is a closer match.

Value or type neither half is the whole story.