1)Synonym:a word or expression that has the same or nearly the same meaning as another in the same language.Synonym中文是“同义词”的意思,举个例子,big和large就是同义词。2)Antonym:The antonym of a word is a word which means the opposite.Antonym中文是“反义词”的意思,举个例子,big和small是反义词。