Koi Carp is a popular and colorful fish species that has many synonyms. Some of the commonly used synonyms for Koi Carp are Nishikigoi, Kuchibeni, Higoi, Kinrin, Doitsu, and Karasu. Nishikigoi, which means "brocade carp," is a Japanese term that refers to the ornamental quality of the fish. Kuchibeni, on the other hand, means "lipstick carp" because of its distinct red lips. Higoi means "red carp" and is recognized for its varying shades of red. Kinrin means "golden scales," while Doitsu refers to a scaleless or partially scaled specimen. Lastly, Karasu means "crow carp" and is identified by its black scales. These synonyms describe the different variations of Koi Carp and its unique characteristics.