1. Thesaurus: A thesaurus is specifically designed to provide synonyms and antonyms for words. It is organized alphabetically and allows you to easily find alternative words with similar meanings.
2. Dictionary: While dictionaries primarily define the meaning of words, many dictionaries also include sections for synonyms and antonyms. You can look up the word and find its definition, along with a list of related words.
However, be mindful that not all synonyms are created equal. Some synonyms might have slightly different shades of meaning, so always consider the context when choosing an alternative word.