I have stumbled across two tags which seem to cover exactly the same thing yet only differ by one letter: non-root-user (42 questions) vs. not-root-user (371 questions).
I have created a synonym proposal on non-root-user because this is where I have the necessary score, but the question would probably be which of the two ones should "survive". non-root-user sounds better that not-root-user to my ears, but the latter has more questions tagged.