There are several synonyms that can be used instead of flagpoles. One common synonym is flagstaff, which refers to a tall pole used to display flags. Another synonym is mast, which is a vertical pole used for supporting sails on a ship or boat. A third synonym is pole, which generally refers to a long, cylindrical object used for various purposes, including displaying flags. A fourth synonym is standard, which refers to a flag or banner used as a symbol of a nation, organization, or unit. Overall, these synonyms can be used interchangeably with flagpoles in most contexts, depending on the specific use and setting.