I just edited the online tag and noted some synonyms for "online" algorithms. Among them are "dynamic" algorithms, so I looked whether we have a dynamic tag or similar and whether making it a synonym for online would be warranted.
We have four tags containing the word "dynamic": dynamic, dynamic-regression, linear-dynamical-system and dynamic-linear-model. From what I can tell, the last three are fine (though the last two could profit from a tag wiki).
However, dynamic is a mess. It looks like it has been inserted in questions on specific techniques that happen to have "dynamic" in their name, or in other instances that have something "dynamic" about them. There is no common overarching theme. I don't, for instance, see a way to write a tag wiki, nor do I believe anyone will ever filter on this unspecific tag.
I propose that dynamic should be deleted and blacklisted, AKA burninated, so it won't be misused in the future. Thoughts?