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Home > Reference > Thesauri

Browse the thesaurus through the alphabetical index of headwords.

Plumb Design Visual Thesaurus
An exploration of sense relationships within the English language. By clicking on words, you follow a thread of meaning, creating a spatial map of linguistic associations.

OECD Macrothesaurus
Organization for Economic Co-operation and Development. Available in English, German, French, and Spanish. Thesaurus of sociological and economic issues pertaining to international development.

Lexical Freenet
Allows you to search for relationships between words and concepts that might never have occurred to you before.

Railroad Definitions
The most complete online railroad glossary: more than 400 entries. Contains American, British, South-African railroad-related terms and slang.

Babynames Thesaurus
You can search for a name from its meanings. The site has more than 10,000 names with meanings.

A Writer's Guide to Sassy Synonyms
Promotion for a reference guide to assist in finding the right word to use in place of said, replied, asked etc.

Phrase Finder
Enter a single word and it will return a list of phrases and sayings that are related to the word in some way. In English.

Freeality Internet Search Thesaurus
Search for words, phrases, and quotations. Links to language tools, reference and research and reverse lookup.
Online publication of Houghton- Mifflin's Roget's II: The New Thesaurus, third edition.

CAS General Subject Vocabulary Helper
Extensive listings for chemistry. Produced by Chemical Abstracts Service, a division of the American Chemical Society.

Roget's Thesaurus - As distributed by Project Gutenberg
Etext of Roget's Thesaurus No. Two, which is derived from the version of Roget's Thesaurus published in 1911.

NASA Thesaurus
National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.

ARTFL Project: ROGET'S Thesaurus Search Form
Uses the Gutenberg Project text.

Wordsmyth Educational Dictionary-Thesaurus
Integrated english dictionary and thesaurus.

WordNet - a Lexical Database for English
An on-line lexical reference system whose design is inspired by current psycholinguistic theories of human lexical memory. English nouns, verbs, adjectives and adverbs are organized into synonym sets, each representing one underlying lexical concept. Different relations link the synonym sets. From the Cognitive Science Laboratory, Princeton University