Collins English Thesaurus Essential Edition: 300,000 Synonyms and Antonyms for Everyday Use (Collins Essential Editions) by Collins Dictionaries English | July 1, 2019 | ISBN: 0008309442 | 992 pages | PDF | 11 Mb
G. W. A. Milne, "Gardner's Commercially Important Chemicals: Synonyms, Trade Names, and Properties" English | ISBN: 0471735183 | 2005 | PDF | 1216 pages | 69 MB
Webster's new dictionary of synonyms: A dictionary of discriminated synonyms with antonyms and analogous and contrasted words by Merriam-Webster English | January 1, 1984 | ISBN: 0877792410 | 945 pages | PDF | 38 Mb