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synonym vs. antonym

[ sin-uh-nim ]
noun
  1. a word having the same or nearly the same meaning as another word in the same language, as happy, joyful, elated. A dictionary of synonyms and antonyms (or opposites), such as Thesaurus.com, is called a thesaurus.
  2. a word or expression accepted as another name for something, as Arcadia for pastoral simplicity or Wall Street for U.S. financial markets;metonym.
  3. one of two or more scientific names applied to a single taxon.
[ an-tuh-nim ]
noun
  1. a word opposite in meaning to another. Fast is an antonym of slow.

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