- WordNet [IA][Direct] -
On-line lexical reference where English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept.
- ARTFL Project: ROGET Form [IA][Direct]
- Astronomy Thesaurus [IA][Direct] -
Astronomy terms in English, French, German, Spanish and Italian; all terms cross referenced.
- Index - Web Thesaurus Compendium [IA][Direct]
- LC Thesaurus for Graphic Material [IA][Direct] -
LCTGM; body of terms for subject indexing of pictures, particularly large general collections of historical images which are found in many libraries, historical societies, archives, and museums.
- Roget's Thesaurus@ (1996)
- Synonyms Dictionary [IA][Direct]
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