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Thesauri Thesauri list word synonyms. Synonyms are words with similar meanings. If you ever find yourself using the same word repeatedly in your research paper you may want to turn to a thesaurus and find another word which has the same meaning. Roget's 21st Century Thesaurus in Dictionary Form is a typical example of a standard thesaurus. Here is a picture of the thesaurus and a sample entry: