I have just noticed that the tag analytic-functions is used by only 14 questions, while the tag analyticity is used by 549 questions. The former tag is also poorly maintained (empty tag wiki). Furthermore, I don't understand what "analytic-functions" could convey that "analyticity" couldn't (maybe that the question is about functions, not manifolds? in this case, we should also create the tags "derivable-functions" and "continuous functions").
Wouldn't you consider appropriate to remove this tag and retag all the 14 questions associated to it with "analyticity"?