I've just come across this quote from Wikipedia:
Russian historian Alexander Nemirovski claimed a strong similarity to Hurrian, which had recently been partially deciphered at the time of the writing of The Lord of the Rings, E. A. Speiser's Introduction to Hurrian appearing in 1941.
How similar are they, actually? What similarities do they have? Grammatical structure? Vocabulary? Is it even possible to tell, seeing how few examples of the Black Speech we have?