The best reference source for finding synonyms and antonyms of a word is a thesaurus. Some popular options include:
- Roget's Thesaurus - A classic and widely used thesaurus that organizes words conceptually.
- Merriam-Webster Thesaurus - Provides an extensive list of synonyms and antonyms along with definitions.
- Cambridge Thesaurus - Offers an easy-to-navigate structure and clear entries.
- Online Thesauruses - Websites like Thesaurus.com and Power Thesaurus provide quick access to synonyms and antonyms.
Using these sources will help you find various alternatives for any given word.