The term 'tortoise' is used to refer to a variety of reptiles, including the REPTILE with seven letters (REPTILE), the TURTLE with six letters (TURTLE), the TERRAPIN with eight letters (TERRAPIN), and the emyd with four letters (EMYD). All of these animals are members of the Testudines order, which includes turtles, tortoises, and terrapins. Tortoises are typically characterized by their large, heavy shells and slow-moving nature. They are found in many parts of the world, from deserts to forests, and can live for up to 150 years.