The term 'Freshwater Carnivorous Mammal' can be summarized as an otter, which is a five-letter word. Otters are semi-aquatic mammals that live in both saltwater and freshwater habitats. They are carnivorous, meaning they feed on fish, crustaceans, and other aquatic animals. Otters have long, slim bodies with short legs and webbed feet, making them excellent swimmers. They also have thick fur to keep them warm in cold water.