Co-extending can be described as two or more things extending equally in the same direction or space. Some antonyms for this term can include "disjointed", "separate", "distinct", "isolated", "discrete", "disconnected", and "divergent". These words suggest a lack of connection or overlap between things, in contrast to the idea of co-extending. For example, two lines that are disjointed do not share any common points or paths, while two lines that are co-extending have the same direction and continue indefinitely without ever intersecting. Similarly, two ideas or concepts that are divergent go in different directions, while co-extending ideas extend in the same direction.