Quasquicentennial is a rare word that means a 125th anniversary celebration. However, there are other words that can be used as synonyms for this word. One of these is a "sesquicentennial," which means a 150th anniversary. Another synonym is "terquasquicentennial," which is used for a 175th anniversary of something. Furthermore, "bicenquinquagenary" is a synonym for a 250th anniversary, while "tricen" can be used to refer to a 300th anniversary celebration. Although these words might not be too commonly used, they serve as great alternatives to quasquicentennial when talking about specific anniversaries.