This is EXACTILY what I've needed. Awesome tool. :)
It reminds me of a book my mother bought that somewhat serves the same purpose:
Descriptionary: A Thematic Dictionary
I think it is a pretty nifty book.
Ever wonder what those gaps on the top of castle walls are called? Oh! They're called 'crenels'. However, therein lies the problem. Who is going to know what a 'crenel' is?