Wordweb does much more than a paper dictionary or thesaurus. WordWeb is truly a Word Web - each set of synonyms is linked to other related sets. Look up "tree", click on the "Types" tab and you'll have a list of different types of tree. Click on "Part of" and WordWeb will tell you that a tree can be part of a "forest" or "wood".
The extensive up-to-date dictionary database features:
WordWeb Pro runs under Windows Vista, Windows 7, 8 and 10 (desktop). You do not need to be online to use WordWeb.
See Using WordWeb pro for screen shots.