Natural English language words

Question

I need the most exhaustive English word list I can find for several types of language processing operations, but I could not find anything on the internet that has good enough quality.

There are 1,000,000 words in the English language including foreign and/or technical words.

Can you please suggest such a source (or close to 500k words) that can be downloaded from the internet that is maybe a bit categorized? What input do you use for your language processing applications?

Answer 1

Kevin's wordlists is the best I know just for lists of words.

WordNet is better if you want to know about things being nouns, verbs etc, synonyms, etc.