Merriam-Webster's Thesaurus
Searchable online thesaurus from Merriam-Webster.
Domain: m-w.com

Merriam-Webster's Word of the Day
A searchable dictionary and thesaurus. Includes word games, daily word with its meaning, history, usage in sentences, and etymology.
Domain: m-w.com

NASA Thesaurus
National Aeronautics and Space Administration Thesaurus. Extensive coverage of scientific terms.
Domain: sti.nasa.gov

Phrases Thesaurus
A resource for writers. 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.
Domain: phrasefinder.co.uk

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.
Domain: plumbdesign.com

Roget's International Thesaurus of English Words and Phrases
85,000 hyperlinked cross-references, plus proverbs and quotations from classic and modern authors.
Domain: bartleby.com

Roget's Thesaurus
Searchable online version of Roget's Thesaurus of English words and phrases.
Domain: thesaurus.com

Roget's Thesaurus - As distributed by Project Gutenberg
E-text of Roget's Thesaurus No. Two, which is derived from the version of Roget's Thesaurus published in 1911.
Domain: asadz.com

Sybrina's Phrase Thesaurus
Creative phrase tool for writers, college students, people just learning English, people wanting to improve their communication skills, artistic professionals and others.
Domain: sybrina.com

The Astronomy Thesaurus
Astronomical terms. Searches may be performed in English, French, German, Italian, and Spanish.
Domain: msowww.anu.edu.au

The Wordsworth Compendium
Program containing over 516,000 English words and phrases to solve word puzzles. Useful for the search and manipulation of words in all aspects of logological activities.
Domain: dictionary-thesaurus.com

Voycabulary
Online dictionary and thesaurus web linking lookup reference tool.
Domain: voycabulary.com

Wordsmyth
American English dictionary with an integrated thesaurus and other lexical resources.
Domain: wordsmyth.net

WordWeb
Free thesaurus dictionary download.
Domain: wordweb.info

WordWeb
A free English thesaurus and dictionary for Windows.
Domain: wordweb.co.uk

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