How real are the languages?
Some are more real than others. Tolkien was a language genius who taught ancient languages (Old Norse and Anglo-Saxon) at Oxford University. He invented the Elvish languages as a hobby. Quenya and Sindarin were completely formed out by Tolkien and we are able to understand their grammar well enough to speak them. They both have a vast amount of vocabulary which he created for them, in the range of around 10,000 words for each. The vocabulary doesn’t include many words for modern things like cars and computers, but these words have been coined by linguists in accordance with Tolkien’s own methods of language formation. All languages have to coin or borrow new words for new things, from time to time. Dwarvish, one of our favorite languages, is unfortunately not so well-known. The grammar has not been published and the vocabulary only includes about 30 words. The language of the Hobbits (also called Westron or Common Speech) is better understood. The grammar was published in Tyalie Tyelel
