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[LOTR] How strong is the Witch King of Angmar compared to other threats?

I was reading the thread on Gandalf vs the Balrog and was thinking of the other strong forces in the books and couldn't figure were the Witch King ranks.  The Balrog takes everything Gandalf the Grey has to beat, Yet when the Witch King faces Gandalf the White, he breaks his staff and mocks him and only the arrival of the Rohirrim saves Gandalf and Minis Tirith from him.  So, my question is was he stronger than the Maiar remaning in Middle Earth?  What about Shelob and the Dragons we know of?  I wonder if the old heros like Hurin or the elf lords like Glorfindel would be able to stand against him.
gpt
IIRC, in the book the Witch King doesn't shatter Gandalf's staff.  In fact, Gandalf tells the Witch King he cannot enter Minas Tirith; they have a little verbal back-and-forth, but the WK does not enter the city.  Rohan shows up then just like the movie, and the WK takes off to deal with that.  So, Gandalf seems to be able to make the WK hesitate at least.