http://visualthesaurus.com – Thinkmap (formerly Plumbdesign) Visual Thesaurus is a gorgeous front end for Wordnet. It takes words as inputs and returns rotating figures of connected synonyms, which can themselves be clicked on to branch synonyms .... Read through the information screens.
"So for fun, I created this color thesaurus for your reference. Of course, there are plenty more color names in the world, so, this is just to get you started." ~ Ingrid Sundberg http://ingridsnotes.wordpress.com/2014/02/04/the-color-thesaurus/