cow shark(n = noun.animal) hexanchus griseus, six-gilled shark - large primitive shark widely distributed in warm seas;
is a kind of shark
is a member of genus hexanchus, hexanchus

angel shark, ant cow, basking shark, blacktip shark, blue shark, bonito shark, bonnet shark, bull shark, card shark, carpet shark, cash cow, cat shark, cow, cow barn, cow chip, cow cockle, cow dung, cow lily, cow man, cow manure, cow oak, cow parsley, cow parsnip, cow pasture, cow pen, cow pie, cow pony, cow tree, cub shark, dairy cow, dusky shark, fox shark, great blue shark, great white shark, hammerhead shark, lemon shark, loan shark, mackerel shark, mad cow disease, mako shark, man-eating shark, milch cow, milk cow, nurse shark, oceanic whitetip shark, reef whitetip shark, requiem shark, sacred cow, sand shark, sandbar shark, sea cow, shark, shark oil, shark repellent, six-gilled shark, smoothhound shark, soupfin shark, springing cow, steller's sea cow, thresher shark, tiger shark, whale shark, white shark, white-tipped shark, whitetip shark