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Full of synonyms, alternatives, and cross-references, reflecting both technical and day-to-day aspects of Modern English.
Roget's II The New Thesaurus
Combines features of a thesaurus and a dictionary; each entry contains a short definition and a comprehensive list of synonyms for the headword.
Oxford Paperback Thesaurus
Offers synonyms and antonyms with usage examples from real English to show how synonyms are used in context.