Genus Hydromys is a scientific classification for a group of semi-aquatic rats commonly found in Southeast Asia and Australia. There are several synonyms that are used to refer to them depending on the specific species or location. Some of the common synonyms used for Genus Hydromys include water rats, rakali, and native water rats. Additionally, some species have their own specific names such as the black-footed water rat or the white-tailed water rat. Understanding these synonyms can help in identifying the different species of Genus Hydromys and make studying and conservation efforts for these animals more effective.