  The difficulties of developing an account which fits that bill are elevated by the fact that there are further requirements it arguably must meet. One such additional requirement is that the account must be plausibly applicable also to other domains besides morality (see Schroeter and Schroeter 2013 and Dunaway and McPherson 2016 for discussions of the relevant constraints). To design an account of reference which entails that there is co-reference in exactly the cases where we intuitively think that people disagree in scenarios such as the Moral Twin Earth one may not be such a difficult task. But the idea behind the additional requirement is that this would be ad hoc if the account were only applicable to moral terms (or to normative terms in general). Note in this context that Boyd takes his account to apply not only to moral terms but to natural kind terms quite generally (which is the type he thinks that “good” and “right” are instances of), including “water” and “gold”. If one were to drop that “generality constraint”, allowing for a metasemantic view that applies just to moral or other normative terms, then the task for the realist would be simpler.