Here's a breakdown:
* Synonyms: Words that have the same or nearly the same meaning as another word. For example, "happy" and "joyful" are synonyms.
* Antonyms: Words that have the opposite meaning of another word. For example, "hot" and "cold" are antonyms.
A thesaurus helps you expand your vocabulary, find more precise words, and avoid repetition in your writing or speech.