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Does anyone know of a resource online that lists all known English words, including plural and singular forms of a word?

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Impossible. There is no Academy that defines what "English words" are and, even if there was, words are being added and changed so often that, if one existed, it would be obsolete in an instant. –  Dour High Arch Jan 5 '11 at 5:07
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oed.com claim to be the definitive record of the English language. –  mgb Apr 13 '11 at 19:14
    
@mgb I may well have to dedicate myself to finding a word they don't have now. They've got "spiflicate." This will be difficult... –  kitukwfyer Apr 14 '11 at 1:12
    
@kitukwfyer - imdb.com/title/tt0526724/quotes –  mgb Apr 14 '11 at 1:52
    
@mgb Indeed...:) –  kitukwfyer Apr 14 '11 at 2:39
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5 Answers 5

Wiktionary

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There's probably no list of all words. But as a starting point you could check whether Ispells (a spell-checker) input files are helpful.

For further resources see also http://wordlist.sourceforge.net/

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WordByLetter.com seems pretty comprehensive. If anything, it seems overly comprehensive, as in I'm not sure all of those are actual English words. But if lists of words is whats you wants, lists of words is whats it has.

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WordNet is much more that just a list, but you may find it useful

WordNet® is a large lexical database of English, developed under the direction of George A. Miller (Emeritus). Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept

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There is no list of all known English words, because there are so many ways to identify what is a word and what is not a word, and so many reasons why a word may or may not be an English word. See this entertaining article in Slate summing up the problem:

http://www.slate.com/articles/life/the_good_word/2006/04/word_count.html

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