What's the noun for lobster? Here's the word you're looking for.
lobster
A crustacean of the Nephropidae family, dark green or blue-black in colour turning bright red when cooked, with a hard shell and claws, which is used as a seafood.
A crustacean of the Palinuridae family, pinkish red in colour, with a hard, spiny shell but no claws, which is used as a seafood.
(slang, historical) A soldier or officer of the imperial British Army (due to their red or scarletuniform).
(slang) An Australian twenty dollar note, due to its reddish-orange colour.