There are several synonyms for the phrase "two-footed animal." One commonly used term is "biped," which refers to any animal that walks on two legs. Another term is "digitigrade," which is used to describe animals that walk on their toes rather than their entire foot, such as birds and some mammals. Additionally, the term "anthropoid" is often used to describe primates like chimpanzees and gorillas, as they closely resemble humans in their physical form. Other terms that can be used to describe two-footed animals include "ambulatory" and "pedestrian." Each of these words offers a slightly different connotation to describe animals with two walking appendages.