otter

n. aquatic webbed-foot mammal that has thick smooth fur and eats fish and is related to weasels and minks (found world-wide); fur of the otter

Otters (Lutrinae) are amphibious (or in one case aquatic) carnivorous mammals. The otter subfamily forms part of the family Mustelidae, which also includes weasels, polecats, badgers, as well as others. With 13 species in 7 genera, otters have an almost worldwide distribution.An otter's den is called a holt. Male otters are dog-otters, females are bitches and babies are cubs. The collective noun romp is sometimes used for a group of otters, being descriptive of their often playful nature. Otter dung is called spraint (or sometimes scat as for other carnivores) – in the  European otter at least this has a not unpleasant, perfume-like smell.
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Noun
1. the fur of an otter
(hypernym) fur, pelt
2. freshwater carnivorous mammal having webbed and clawed feet and dark brown fur
(hypernym) musteline mammal, mustelid, musteline
(hyponym) river otter, Lutra canadensis
(member-holonym) Lutra, genus Lutra

n. otter, aquatic mammal, sea otter

n. adder, common European viper

n. otter