There are two nearly identical tags for network questions related to Docker.
While most of the questions in both tags seem off-topic (not about programming), it seems that having two separate and (at least to me) indistinguishable tags is clearly excessive.
Personally, I would prefer docker-network as the primary tag; but docker-networking has more questions (966 vs 265), more watchers (134 vs 28), and a tag wiki.
On the other hand, docker network is a specific Docker subcommand, similar to docker build, docker run, etc; perhaps there is some merit in theory to attempting to keep the two separate? But in practice, I don't think we can.
There are a few dozen users with enough reputation in either tag to propose and vote on a synonym proposal; my impression is that this is by far insufficient to successfully establish a synonym without moderator involvement (though pointers to guidelines or statistics to better inform this are most welcome).