cetacean: large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
sharpie: a shallow-draft sailboat with a sharp prow, flat bottom, and triangular sail; formerly used along the northern Atlantic coast of the United States