There are several synonyms for the term "animal pen". One of the most common is "corral", which refers to an enclosed area used to contain livestock. Another synonym is "paddock", which is often used to describe a small, fenced-in area used to keep horses or other grazing animals. "Stable" is another term used to describe a structure used to house animals, particularly horses. A "kennel" is a type of animal pen used to house dogs. "Cage" or "enclosure" is used to refer to small animal pens, such as those used to house birds or rodents. Regardless of the specific term used, animal pens serve an important purpose in keeping animals safe and secure.