This document defines synonyms and antonyms and provides examples of word pairs that are synonyms and antonyms. It explains that synonyms are words that mean the same thing, while antonyms are words that mean the opposite. Examples of synonym pairs include big/large and happy/glad, and examples of antonym pairs include hot/cold and happy/sad. The document goes on to list additional synonym and antonym pairs and provides links to online games about synonyms and antonyms for students to play.