The Furry Swimmer term is composed of two crossword solutions, Otter (5 letters) and SEAL (4 letters). Otters are semi-aquatic mammals that live in rivers, lakes, and oceans. They have webbed feet and a thick fur coat to keep them warm in the water. Seals are also semi-aquatic mammals that live in the ocean. They have a streamlined body and flippers to help them swim quickly. Both otters and seals are furry swimmers.