The term relative of a squid can be answered with the 10-letter word CUTTLEFISH. CUTTLEFISH are marine animals that belong to the same family as squids and octopuses. They have a unique internal shell, called a cuttlebone, which helps them to control their buoyancy in the water. CUTTLEFISH also have eight arms and two tentacles, and they use these to capture prey. They are found in temperate and tropical waters around the world.