The document discusses synonyms and antonyms. It defines synonyms as words that have the same or similar meanings, and provides examples of synonym pairs like "smart" and "intelligent." It defines antonyms as words with opposite meanings, giving the example of "black" and "white" as antonyms. The document emphasizes that knowing synonyms and antonyms can improve vocabulary and make writing more powerful. It provides steps and practice examples for identifying synonyms and antonyms.