A Meta-Ethical disagreement about whether Moral Facts exist. It assumes Truth-Aptness. Moral Nihilism is opposed to moral realism. Moral beliefs are Normative Claim about what you should do.
Subdomains
There is debate between the moral realists as to Owhat constitutes a moral fact.
Second Order Claim
All second order claims refer to first order claims. (And the debate of truth-aptness) Example: There is an objective answer to whether “killing is wrong”