Depends on the package really. But talking generally, there are many things you can do with Word that you can also do with a DTP package, like positioning pictures. However, you'd be better using DTP for such things. That's because a word processor treats a document as linear, while DTP packages treat a page as a jigsaw of different elements. So it's much easier to arrange the elements of a page in DTP. (If this doesn't make any sense, let me know and I'll try to be a bit clearer.)