Web2.gz is the headword list from Webster's International Dictionary,
Second Edition.  It contains 234,936 words.  Most inflected forms are
not included, but it contains a large number of terms from scientific
and technical jargon.

words.gz is a typical Unix spell-checking word list; it contains
25,143 words.  Inflected forms are not included, and there are a
number of strange omissions.

wordnet.gz is derived from the Wordnet 1.6 sources
(http://www.cogsci.princeton.edu/~wn/) and includes inflected forms
and common hyphenated and multiple-word phrases.  It contains 83,329
single words and 51,185 multiple-word phrases.