The best choice for finding the synonyms and antonyms of a word is a thesaurus.
The best choice for finding synonyms and antonyms of a word is a thesaurus. A thesaurus is a reference source specifically designed to provide synonyms and antonyms for words. It is organized in alphabetical order and lists words that have similar or opposite meanings to the word you are searching for. You can find a thesaurus in book form or use online thesauri available on various websites or as a feature in word-processing software. So, the correct answer is thesaurus.