WordNet sense 1 (meat of large cold-water crab; mainly leg meat):

Alaska king crab, Alaska crab, Alaskan king crab

WordNet sense 2 (a large spider crab of Europe):

European spider crab, Maja squinado

WordNet sense 3 (large edible crab of northern Pacific waters especially along the coasts of Alaska and Japan):

Paralithodes camtschatica

WordNet sense 4 (large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse):

horseshoe crab, Limulus polyphemus, Xiphosurus polyphemus