Yes. Per @akanter here, if a name is fully specified, then it shouldn’t refer to something else.
@ball pointed out cases where even CIEL has challenges with this rule, when an FSN is used for general terms (like Absent), that may be useful as synonyms elsewhere. But I think we have fixed all of those cases in CIEL.
I assume Andy’s recommendation for when these conflicts arise would be to fix the FSN to be more fully specified – e.g., change “Grey” to “Grey color” and make “Grey” a synonym & preferred (so concept still shows as “Grey” but has a fully specified name that is less ambiguous).