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Visual Thesaurus (YouTube Channel)
Thinkmap Visual Thesaurus (Plumb Design)
WordNet – a Lexical Database for English (Cognitive Science Laboratory, Princeton University)
Visuwords (Goocto.com)

Reference Portal, Dictionary, Thesaurus, Glossary, Encyclopedia, Introduction, Outline, Directory, Search

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These are organized by a classification scheme developed exclusively for Cosma. More…

General

Dictionary

thesaurus : (1) a book of words or of information about a particular field or set of concepts; especially : a book of words and their synonyms (2) a list of subject headings or descriptors usually with a cross-reference system for use in the organization of a collection of documents for reference and retrieval — Webster See also Oxford, OneLook, Free Dictionary, Wiktionary, InfoPlease, Word Reference, Urban Dictionary

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

Thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms), in contrast to a dictionary, which provides definitions for words, and generally lists them in alphabetical order. The main purpose of such reference works is to help the user “to find the word, or words, by which [an] idea may be most fitly and aptly expressed” – to quote Peter Mark Roget, architect of the best known thesaurus in the English language. — Wikipedia

Britannica, Columbia (Infoplease), Wikipedia