There are several synonyms for the word "vertebrated" that can be used to describe animals with a backbone. Some commonly used synonyms include "vertebrate," "chordate," "backboned," and "spinal." These terms are typically used to describe animals that have a well-developed spinal column, which provides structure and support for the body, and protects the spinal cord. Vertebrated animals include fish, birds, reptiles, amphibians, and mammals. The use of synonyms for "vertebrated" can help to provide more variety and depth to descriptions of animals, and can be useful for scientific research and classification.