Let's we make them synonym [11].
Why not to delete
This is a general point of view about the tags change/renaming:
there is people that distinguishes among similar answers through the tags
(Similar, not only inside a single stack exchange site).
Moreover it's possible that I remember how to arrive to a question find in the past specifying that tag and some other words meanwhile I don't remember its title.
When we delete a tag we go to damage that kind of memory and research.Let's do them synonym[11]
Said that, I agree that those two tags should be "synonymized".What more
We can choose one tag, leaving the other with an excerpt that says something similar to:
"Deprecated tag synonym of the_other_tag, please use the_other_tag instead".
