Actually (since I’ve received an astonishing amount of supposed corrections on the matter…
Nazgûl and Ringwraiths are the same thing. Translated from the Black Speech, nazg means “ring” and gûl means “wraith”. The nine servants of Sauron are The Nazgûl, whether they ride horses or fell beasts makes no difference.
LOTR is a big heavy book that was written before the films came out. Pick it up sometime. Build a fort and crawl inside with a flashlight (no space heaters, you’ll die in there) and the ONE big book (not the 3 separate books, as Tolkien was furious that his story was split into a trilogy. You must read it as he intended). Place this sign outside, and don’t come out until you’ve read ALL the way through the Appendix. That shit’s loaded with good stuff.
art by the insanely skilled John Howe