Nephrozoa is a term used to describe a group of animals that possess a functional kidney, including vertebrates and certain invertebrates. Synonyms for the term Nephrozoa include Deuterostomia, Echinodermata, and Chordata. Deuterostomia is a clade of animals that includes echinoderms, hemichordates, and chordates, while Echinodermata refers to a group of marine animals that includes sea urchins, starfish, and sea cucumbers. Chordata encompasses all animals that possess a notochord, such as fish, reptiles, mammals, and birds. These synonyms are important as they can be used interchangeably when discussing the evolution and classification of organisms with functional kidneys.