The term Polecat Relative is referring to an Otter, which is a five letter word. Otters are semi-aquatic mammals that are found in many parts of the world. They have long, slim bodies and short legs, and their fur is usually thick and waterproof. Otters are known for their playful behavior and are often seen sliding down muddy banks or playing with rocks and sticks. They are also skilled swimmers and can stay underwater for up to eight minutes.