Moral skepticism and nihilism both hold that moral truths are relative to cultures or individuals.

Moral skepticism and nihilism are the same thing.

Nihilism holds that we cannot have knowledge or justified beliefs about moral claims, while moral skepticism holds that there are no moral truths at all.

Moral skepticism holds that we cannot have knowledge or justified beliefs about moral claims, while nihilism holds that there are no moral truths at all.