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Thesauri contain synonyms and antonyms and are useful for finding alternative terms for your writing and speech.
Use the search box at the top of the page to search Roget’s II: The New Thesaurus. This site has a lot of advertisments but is easy to use.
Merriam-Webster's Collegiate Thesaurus
Provided through our subscription to Encyclopedia Britannica Online: Academic Edition.
Roget’s II: The New Thesaurus
Roget's Thesaurus is an authoritative source for synonyms. Using Roget's web site, you can search your term and easily locate synonyms. The main site, bartleby.com, offers tons of other literary resources too, including Bartlett's Quotations, Emily Post's Etiquette, and the Oxford Shakespeare. Use the dropdown menus to explore these options.
Getty Thesaurus of Geographic Names
The Getty Thesaurus of Geographic Names provides terms for proper names and associated information about places, such as political entities (i.e. cities and nations) as well as physical features (i.e. mountains and lakes). The Getty Thesaurus of Geographic Names can be used to find useful search terms as well as information about the term's evolution and background.