The term OCTOPUS RELATIVE is a crossword solution that can be filled in with the word SQUID, which has five letters. Squids are cephalopods, a group of marine animals that also includes octopuses, cuttlefish, and nautiluses. They have eight arms and two tentacles, and they are found in all of the world's oceans. Squids are known for their ability to rapidly change color and swim quickly. They are an important food source for many species of fish, birds, and marine mammals.