Please dont blame me for inaccuracies below - Although, I have put these in order of which I think are most accurate first.

Quenya Corpus Wordlist - Many Quenya Words. Page from Ardalambion Site.

Quenya / Sindarin Vocab - Selected Vocab from Both. Last page linked from Ardalambion Site.

Phrasebook - A small, but nice, elvish phrasebook.

Quenya - English Word List - Shorter, but still good.

English - Sindarin Word List - Like the Reverse of the Above.

English -> Quenya Word list - I quote : "This might no be the most accurate wordlist, but it's lengthy."

Quenya -> English Word List - Same person as the above. Its Quite long!