Antonyms for the word "more coterminous" could include "disjointed," "separate," or "dissimilar." These words imply a lack of alignment or connection between two things or entities. While "coterminous" suggests a high degree of overlapping or coexistence, the antonyms suggest a lack of this quality. For example, two neighboring countries could be coterminous if their borders are the same, but they would be disjointed if they had few connections or shared interests. Similarly, two organizations might be coterminous if they have similar goals or memberships, but they would be dissimilar if they operated in completely different fields or with different values.