Is The Nazgul The Dragon. It is also possible that it is supposed to be the largest flying dragon left in the world in third age 3019. Which means lord in the dragon language.
Why did the 9 men become ringwraiths? However, we can clearly see that smaug from the hobbit's tale, could speak, covet gold, fly and breathe fire. They could be similar to wyrms, creatures akin to dragons.