Upgrading from:

Miscellaneous`Dictionary`

New function WordData has been added to the built-in Mathematica kernel.
New function DictionaryLookup has been added to the built-in Mathematica kernel.

Look up all words in the dictionary starting with "m" and ending with "th":

Version 5.2 << Miscellaneous`Dictionary`;
FindWords["m" ~~ ___ ~~ "th"]

Anagrams for single-word results can be replaced by the following simple definition:

Miscellaneous`Dictionary` was available as an add-on package in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6796.