15 Places to Find Different Types of Thesauri

The Agricultural Thesaurus

The Art and Architecture Thesaurus

Astronomy Thesaurus

The Cook's Thesaurus

German Thesaurus

Getty Thesaurus of Geographic Names

Hyperdictionary

Infoplease Thesaurus

Mathematics Thesaurus- search in nine languages

Merriam-Webster Thesaurus

Roget's International Thesaurus- choose from drop-doen menu

Snappy Words- free visual online dictionary and thesaurus

Thesaurus.com

ThinkMap Visual Thesaurus

Voycabulary-online Web dictionary & thesaurus word linking tool; twenty-nine languages!