Thesaurus

A thesaurus is a reference book or online tool that lists words grouped together according to their meanings. Instead of providing definitions like a dictionary, a thesaurus offers synonyms—words that have similar meanings—and sometimes antonyms, which are words with opposite meanings. It helps writers and speakers find the right word to express an idea more effectively, avoid repetition, or enhance their vocabulary. For example, if you look up the word "happy," a thesaurus might suggest "joyful," "content," or "cheerful" as alternatives.