Urochordate is a term that is used to refer to any of the marine invertebrates belonging to the phylum Chordata. This phylum is comprised of animals that are characterized by the presence of a notochord, or flexible rod-like structure, at some point in their lives. As a result, identifying synonyms for the word "urochordate" means finding alternative names for the animals within this phylum. Some synonyms for urochordate might include things like tunicates or sea squirts, which are two well-known examples of organisms within the Chordata phylum. Other synonyms for urochordate might be ascidians or salps, which are less commonly known but still accurate terms for these animals.