The word "terrapins" can be replaced by several synonyms such as "turtles," "tortoises," "chelonians," or "sea turtles." Terrapins are small freshwater turtles that are typically found in North America. They are distinguished by their flat, oval-shaped shells and webbed feet that make them excellent swimmers. The term "turtle" is often used as a general term for all members of the Testudines order, which includes tortoises, terrapins, and turtles. Meanwhile, chelonians are reptiles with a shell that serves as their external skeleton. Lastly, sea turtles are marine turtles that spend most of their lives in the ocean. Despite their differences, all these synonyms for terrapins are equally fascinating and unique.