What's the best dictionary Having all the words including archaic words?
This is surely an excellent and important question. I expect that what you're looking for doesn't exist.
Or at least if it does exist it would comprise several volumes, or require a special, dedicated table to support it.
Recent experience has shown that most give only passing mention to obsolete uses, if they give any at all. If you intend to study old literature in depth, you really need a volume which concentrates comprehensively on the period you're interested in. Such a volume would probably be useless in dealing with rapidly changing current usage.

Best regards, - A.Emotion: smile
The most comprehensive dictionary for English is the Oxford English Dictionary. It is the oldest continuously published dictionary of the language.

The printed unabridged edition is about 20 large volumes, covering more than 500,000 words. It is global (dialects from different English-speacking countries), historical (etymology and morphology going back to the roots of words), and current (comprehensive quarterly updates).

It is available on line, print, and CD . There is a very limited free on-line resource; the other editions are not inexpensive.
The site has a lot of infomation about the dictionary, its history, its philosophy, and structure.
Note that there are various editions: The "Concise", the "Shorter" and the "Pocket." These are abridged (contain less information) from the full version.
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Thanks, A/S.
I'm definitely not an expert in the qualities of various dictionaries. I use The American Heritage of the English Language. It is very user-friendly, with many references to history, acceptability, use, special cases, etc., of the entries. Obviously, it is no match for the Oxford, but it is rare that I do not find the answer to any question I might have about a word.
Hi Philip,
The American Heritage is the one I have at my elbow, but it let me down on "uncomprehensive," a word one of our posters inquired about. It turned up in a dictionary published at the turn of the last century.
The originator of this thread, Coloraday, is now reading older books, as wholegrainonce was. Very challenging.Emotion: smile
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Thanks for answers.I think the Oxford is the best one.But i think it too expensive for me.