Merriam-Webster's Intermediate Thesaurus
Key Features :
i : 19,000 main entries with statements describing the meaning shared by the synonyms provided.
ii : Nearly 28,000 synonyms; over 71,000 related words; over 8,000 antonyms; and over 30,000 near antonyms provided.
iii : Many entries contain multiple senses, each with a definition and usage example
iv : Over 32,000 usage examples.
v : Newly added vocabulary that pays particular attention to this age group in the areas of social media, technology, and entertainment.