Diacritics are marks that are added to letters to change their pronunciation or meaning. There are several synonyms for diacritics, including diacritical marks, accent marks, and accent symbols. These marks are used in many languages including French, Spanish, and German. In some languages, diacritics can completely change the meaning of a word, making their use essential for proper communication. Other synonyms for diacritics include accentuation marks, stress marks, and tonal markers. No matter what they are called, these marks play an important role in helping people communicate accurately in their own language and with others who speak different languages.