This document discusses how to use a thesaurus to find synonyms and antonyms. It explains that a thesaurus can be used to find words that have similar or opposite meanings to help with writing. It provides examples of looking up the word "legalize" to find synonyms like "permit" and "allow", and antonyms like "prohibit" and "outlaw". It also recommends having students practice using a thesaurus by finding synonyms and antonyms for words from their readings.