The document discusses different types of antonyms. It defines an antonym as a word with an opposite meaning and provides examples like up-down. It explains that some antonyms are strictly opposites, like yes-no, while others allow for more flexibility depending on usage, like right-left. It also describes graded antonyms that exist on a scale, like good-bad, and complementary antonyms that only have two opposite possibilities, like true-false.