For those who want to explore words I recommend Visual Thesaurus®. As the name implies it is a visual tool. Type in a word and it builds an animated 2D or 3D tree of synonyms and related words. Clicking a linked word opens up new trees. The nodes that connect the words include explanations. The tool offers audio pronunciations in US and UK English.

Visual Thesaurus® is available as a desktop edition for Windows/OS X and as on online service.

Visit www.visualthesaurus.com

Visualthesaurus
Image © Visual Thesaurus