Hi folks,
just stumbled upon this online thingy -- looks like it's not mentioned on englishforums yet.
http://www.visuwords.com/Click on Random or enter a word at the top right corner. Enjoy! :-)
"Visuwords™ online graphical dictionary — Look up words
to find their meanings and associations with other words and concepts. Produce
diagrams reminiscent of a neural net. Learn how words associate."
"Visuwords™ uses Princeton University’s
WordNet, an opensource
database built by University students and language researchers."