This document defines synonyms and antonyms. It states that synonyms are words that have similar or nearly the same meanings, while being the same part of speech. Antonyms are words that have opposite meanings but are also the same part of speech. It provides examples of synonyms and antonyms for different parts of speech like nouns, verbs, adjectives, and adverbs. Finally, it emphasizes the importance of knowing synonyms and antonyms to improve reading, writing, and vocabulary skills.