Encarta Online Encyclopedia 16,000 articles, more than 2,200 photos, illustrations, charts, maps and tables. Encylopedia Smithsonian Answers to frequently asked questions. People Biographical Dictionary Over 19,000 concise biographies. This is a quirky resource, with splendid links to other quotation sites. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept.
Different relations link the synonym sets.
Here is Roget's Thesaurus in an easy to use format.