synonymical

• a word derived from synonym.
  synonym

  noun

  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.
• a word derived from synonymic.
  synonymic

  adjective

  of or relating to synonyms; being a synonym.

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