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I Think it is Both.
Arrangement of entries are based on classification so it is a classified list of words. And it is a book of synonyms and Antonyms.
Classified list of words is Classeras and
Roget's International Thesaurus is book of synonyms
not classifed list that is alphabetical List/Book of words that is "A-Z"
|"A COMPLETE BOOK OF SYNONYMS AND ANTONYMS FOUNDED UPON AND EMBODYING ROGET’S ORIGINAL WORK WITH NUMEROUS ADDITIONS AND MODERNIZATIONS"
NEW YORK: THOMAS Y. CROWELL, 1922
NEW YORK: BARTLEBY.COM, 2000
thank you very much to all of u for your valuable replies...