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Roget's Thesaurus is part of Project Gutenberg: https://www.gutenberg.org/ebooks/22 https://www.gutenberg.org/ebooks/22

• adolph 1mo ago
  From the preamble of the edition published by PG: Note that this version of Thesaurus-1911 has been supplemented with over 1,000 words not present in the original 1911 edition, but many modern words are still missing. About 1500 verbs (out of 6500) which can be found in an 80,000-word spell-checker are absent from this work. The deficiency of nouns is probably much worse, especially on technical topics. Of 40,000 unique words contained in the original text, 12,000 are not recognized by a spell-checker. Most of these are foreign words (primarily Latin), and many are obsolete.