Order Synentognathi is a scientific term used to describe a group of fish species that have unique jaw structures. However, there are several synonyms for this term that can be used interchangeably. These include the suborder Heterostomatoidei, the families Pegasidae and Centriscidae, and the common names for some species such as the Razorfish and Boarfish. It is important to understand these synonyms to be able to communicate effectively about this group of fish. So, whether you are a scientist, fish enthusiast, or just someone interested in the natural world, understanding the various synonyms for Order Synentognathi is crucial.