Assume for a moment that a large group of people believe that film noir and neo-noir are mutually exclusive film categories. For example, if Chinatown (1974) is to be considered neo-noir (made after the classic 1940-1959 era, in color, etc.) then it is by their strict definition NOT [classic] “film noir”. (Maybe they worked in video stores and a movie had to go in one section or the other.)
But another group feels that “film noir” is a right and proper term for both categories of movies, but “neo-noir” only works with the one. The terms are then not “mutually exclusive”, they are “_____________” relative to how this second group of people see the relationship.
I expect there is a semantic term that describes exactly this relationship between two specific terms. If not, let's best approximate.
So, the second group of people might say: “Film noir and neo-noir are ______________ terms.”
(Hopefully we can avoid argumentative debate here about proper film taxonomy, as that's not the point. I'm just looking for the best term. As I currently see it, we might just as easily be talking about “soccer ball” and “football”. An assumed large group of people believing the second term works for the first just as well, but not the other way around. Or “Scotch” & “whisky” – etc. I hope these extra examples can be useful to underline the universality of the term requested, vs. obscuring it.)