You should be aware that the Grey Company's "Elvish" is not Tolkien's Elvish; it's primarily the invention of the site's creators, though it does include a fairly random hodge-podge of Quenya and Sindarin.
The best site on Tolkien's Elvish languages (particularly Quenya) is probably
Ardalambion. A decent English-Quenya wordlist is the
Quettaparma Quenyanna, though it does contain a few inaccuracies.