Thesaurus.Com
Free online Roget's Thesaurus of the English Language. A leading provider of language reference products and services on the Internet. Simply type a word in the search box and click the 'Search' button.

Dictionary.Com
A multi-source dictionary search service, free online English dictionary, thesaurus and reference guide, crossword puzzles and other word games, online translator and Word of the Day.

The Cook's Thesaurus
A cooking encyclopedia that covers thousands of ingredients and kitchen tools. Entries include pictures, descriptions, synonyms, pronunciations, and suggested substitutions.

Thesaurus.Maths.Org
This site contains brief explanations of mathematical terms and ideas in English, Danish, Finnish, Hungarian, Lithuanian, Polish, Slovak. You can either navigate the site by following the links on each page, or use our graph browser.

Getty
The Art & Architecture Thesaurus® (AAT) is a structured vocabulary for describing and indexing the visual arts and architecture. The programs of the J. Paul Getty Trust focus on the visual arts in all of their dimensions, serving both general audiences and specialized professionals.