Not actually an answer to your question, but hopefully a suggestion you might use: Why don't you let your students write their own collaborative glossary? This way you create an extensive glossary, based on a discussion. It saves you work (although you would probably have to moderate the discussion) because the bulk of the work is distributed. The Moodle glossary module is really made for this kind of thing!
I was thinking the same thing as Hans. Why not assign students to post both their own ideas, as well as copying and posting some items from your old glossary. Post the current MS Word file on the site for all to see, then have each student to input an assigned number of entries. That way they can get used to creating glossaries. Then as further homework, have them each post 2 "missing" concepts that they research and write.