What are the levels of wizards in Lord of the Rings?

Related questions

1. Who killed gothmog the Balrog?
2. Did Grindelwald kill Ariana?
3. How long did Gandalf fall?
4. How did Grindelwald die?
5. Is gothmog in The Hobbit?
6. Who is Aragorn's love interest?
7. Did Picard and Crusher married?
8. Is Gandalf in The Silmarillion?
9. Who is Ian McKellen's current partner?
10. Did Voldemort kill Grindelwald?

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12. #white
13. #istari
14. #gandalf
15. #names