- Alcohol and Other Drug Thesaurus - AOD - National Institutes of Health thesaurus. Provides resource for medical, social, and demographic terms related to alcohol and drug use.
- Art and Architecture Thesaurus - Getty's terms, as used in several AAT indexes.
- Babynames Thesaurus - You can search for a name from its meanings. The site has more than 10,000 names with meanings.
- CAS General Subject Vocabulary Helper - Extensive listings for chemistry. Produced by Chemical Abstracts Service, a division of the American Chemical Society.
- Concept Space - Management education thesaurus from the London Business School organizes terms into a solar system of related ideas.
- Eurodic Autom - European Union terminology. Available on most European Union languages.
- Getty Thesaurus of Geographic Names - Structured vocabulary of place names.
- Library of Congress Classification Schedules - A comprehensive list of LOC Classification schedules.
- Library of Congress Thesauri - Links to multiple LOC thesauri, including GLIN, the Global Legal Information Network.
- Maths Thesaurus - Definitions of common mathematical terms, along with broader, narrower, and related concepts.
- NASA Thesaurus - National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.
- The Astronomy Thesaurus - Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.
- Thesaurus of Musical Instruments - Over a thousand instruments, with relational links based on the Library of Congress Subject Headings.
