This is a really neat dictionary, perfect for writers who always have the word they want on the tip of their tongue but don't exactly remember what it is. For example, if you look up something generic, like "window," the entry will consist of a listing of different types of windows, from bay to jalousie to sash. It tells you the name of the panels of glass and the frames separating them. It gives you pictures of different types of windows and exterior housings.
In short, it will help take your prose from generic to specific and help you increase your vocabulary and knowledge along the way. Littered with pictures and tables on all sorts of items, it should be on every writer's shelf.