Antonyms are used to express the opposite of a word. Antonym definitionĪn antonym is a word, adjective, verb or expression whose meaning is opposite to that of a word. This avoids repetitions in a sentence without changing its meaning. Synonyms are other words that mean the same thing. BrooksĪ synonym is a word, adjective, verb or expression that has the same meaning as another, or almost the same meaning.