I believe that, with the proper research and thought, new words can be an acceptable thing, considering that Tolkien did leave an incomplete language. As long as his original feel is maintained, new words aren't necessarily a bad thing.
Quote:
A man may indeed change his spoon or his cup at his will, and need ask none to advise him or to follow his choice. It is other indeed with words or the modes and devices of speech. Let him bethink him of a new word, be it to his heart howsoever fresh and fair, it will avail him little in converse, until other men are of like mind or will receive his invention.
But among the Eldar there are many quick ears and subtle minds to hear and appraise such inventions, and though many be the patterns and devices so made that prove in the end only pleasing to a few, or to one alone, many others are welcomed and pass swiftly from mouth to mouth, with laughter or delight or with solemn thought - as maybe a new jest or new-found saying of wisdom will pass among men of brighter wit. For to the Eldar the making of speech is the oldest of the arts and the most beloved.
~J.R.R. Tolkien, Dangweth Pengolodh
But among the Eldar there are many quick ears and subtle minds to hear and appraise such inventions, and though many be the patterns and devices so made that prove in the end only pleasing to a few, or to one alone, many others are welcomed and pass swiftly from mouth to mouth, with laughter or delight or with solemn thought - as maybe a new jest or new-found saying of wisdom will pass among men of brighter wit. For to the Eldar the making of speech is the oldest of the arts and the most beloved.
~J.R.R. Tolkien, Dangweth Pengolodh
(Taken from the site Parma Penyanë Quettaron)
