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| Roget's II: The New Thesaurus Online version of this synonym dictionary features word definitions and a hyperlinked category index. | |
| Miriam-Webster Thesaurus Online version of the English thesaurus. | ||
| Roget's Thesaurus Searches the headwords or full text of Roget's Thesaurus, 1911, version. | ||
| Canadian Thesaurus of Construction Science and Technology Searchable in English and French. Alphabetical index and thesaurus of terms related to construction and materials science. | ||
| Comprehensive Taxonomy Factiva Taxonomy. End-to-End Metadata and Taxonomy Solutions. | ||
| The Wordsmyth English Dictionary-Thesaurus Educational dictionary and thesaurus published by the Wordsmyth Collaborative. | ||
| Thesaurus.com Award winning online version of Roget's Thesaurus of English words and phrases. | ||
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