The term 'slow-moving reptile' can be summarized by two crossword solutions: TURTLE (6 letters) and TORTOISE (8 letters). Turtles and tortoises are both reptiles that are known for their slow movement. Turtles are typically found in water, while tortoises are found on land. They both have a hard shell that protects them from predators. Turtles and tortoises are both long-lived animals, with some species living up to 150 years.