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Wordbook hasn't to my knowledge been developed for a while, Lexicon however was originally wordbook and then picked up and developed further by another talented person.
I'm not sure of the latest version as I always followed progress on Dev.XOOPS but that's still down at the moment, not sure what date if any it will be back on-line.
I do however have a copy of the Lexicon module (renamed to encyclopedia), which seems stable enough, I believe it's version 0.6 release on 27-03-2007 - If you want it then please drop me a pm.
Kind Regards.
Tom
http://bassmanthemes.com
http://www.xoopslance.com