By the way

Since there are no moral propositions, there are also no moral questions.

Since "wrong" has no meaning (does not denote), "Murder is wrong" has none.

And likewise "Is murder wrong?"

And "Is it true that murder is wrong?"

And "Is there a possible world in which murder is wrong?"

But is there a possible world in which there are moral properties, as Mackie asked?

Properties are necessary, and so the same in every world. 

That is not to say they are each and all necessarily exemplified, however. 

So, given a suitable and convincing description, one could ask are there moral properties?

See Mackie. 

And no, I don't think so. 

Well, is there a world in which normative terms in moral use denote?

Of course.

Just as there is a world in which 'xrtyn' denotes.

So?