The term 'Polecat Cousin' refers to three different animals: the Otter (5 letters), the FERRET (6 letters), and the SABLE (5 letters). The Otter is a semi-aquatic mammal found in rivers, lakes, and oceans around the world. The FERRET is a domesticated mammal of the Mustelidae family, related to the weasel, and is often kept as a pet. The SABLE is a species of marten found in northern Europe and Asia, and is known for its luxurious fur. All three animals are closely related and are all members of the Mustelidae family.