- Astronomy Thesaurus
 - Thesaurus of astronomy terms and synonyms in English, French, German, Spanish and Italian. From the Research School of Astronomy and Astrophysics. - Getty Art and Architecture Thesaurus
- Searchable database and thesaurus of concepts related to art, architecture, and material culture. Browse the Getty Vocabularies and find terms for specific styles and periods, agents, built works, materials, and techniques.
- Getty Thesaurus of Geographic Names
- Find place and feature names worldwide with the Getty Thesaurus of Place Names. Results include coordinates as well as contextual information such as state and province.
- HIV/AIDS Treatment Thesaurus
- English and French thesaurus created to organise and find information in the field of HIV/AIDS treatment. Find the preferred term and spelling for medications, symptoms, and other HIV and AIDS issues.
- Lexical FreeNet
- Online dictionary and thesaurus. Lexical FreeNet helps you find rhymes, similar spellings, or related meanings between words and phrases.
- Library of Congress Thesauri (6)
- Merriam-Webster Online Thesaurus
- Online version of the Merriam-Webster thesaurus. Find synonyms, spelling help, and related terms for English words and phrases.
- Phrase Thesaurus
- Find synonyms, equivalents, and related words for an English phrase with the Phrase Thesaurus. Find new ways to say or write cliches, proverbs, sayings, and quotations.
- Poetry.com Rhyming Dictionary and Thesaurus
- Searchable dictionary and thesaurus that helps you find rhymes and synonyms for English words and phrases.
- questsin
- Artificial intelligence project offers a dynamic thesaurus that generates synonyms, antonyms, and relational word lists.
- Roget's II: The New Thesaurus, Third Edition
- Online edition of Roget's Thesaurus, the well-known reference work that lets users find synonyms, antonyms, and variant forms of English words and phrases.
- Synonym.com
- Look up synonyms, antonyms, and definitions for English words with this online thesaurus.
- Synonyms.net
- Online synonyms thesaurus reference resource that also provides images for search terms.
- Thesaurus.com: Roget's Thesaurus
- Online version of Roget's Thesaurus. Find synonyms, antonyms, related words, and one-word definitions of English words and phrases.
- Thinkmap Visual Thesaurus
- See synonyms, antonyms, and other word relationships in a new way with the Thinkmap Visual Thesaurus. Search for the word you're looking for, and then explore a visual network of related terms. Subscription required.
- Web WordNet 2.0
- Online interface to Princeton's thesaurus and lexical database for the English language. Find synonym sets for nouns, verbs, adjectives, linked to their underlying lexical concepts and relations.
- Wordsmyth English Dictionary-Thesaurus
- Online dictionary, thesaurus, and other American English resources for students and the general public. Find word definitions, spellings, and synonyms, or try tools like the Wordsmyth glossary maker or anagram solver.
- Yahoo! Reference
- Find an online encyclopedia, quotations, and other fact-finding tools at Yahoo! Reference. Search for dictionary definitions, spelling help, thesaurus synonyms, maps, flags, and other answers.
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