"Fiacre" is a French word that refers to a light, two-wheeled carriage pulled by a single horse. However, there are several synonyms that can be used to describe this type of carriage. For example, it can be referred to as a cabriolet, which is a French word that means "convertible". Another word that can be used is a "jaunting car", which is a type of cart that was traditionally used in Ireland. "Hansom" is another word that is sometimes used to describe this type of carriage, particularly when it has a roof. Although "fiacre" is the original word, these synonyms can be used to describe a similar type of carriage in various contexts.