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Antonym. An antonym is a semantic term for words that have opposite meanings or definitions. To simply put it, an antonym is an opposite of another word. In other words, they are antonyms of one another.
A synonym is a word or phrase that means exactly or nearly the same as another word or phrase in the same language. Words that are synonyms are said to be synonymous, and the state of being a synonym is called synonymy.
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