A cephalopod mollusk is a unique creature that belongs to the mollusk family. But there are various other words that can be used to describe this fascinating creature. Some of the synonyms that can be used for a cephalopod mollusk include octopus, squid, cuttlefish, nautilus, and chambered nautilus. These synonyms all refer to a type of marine animal that has a head and tentacles, which they use to catch prey and defend themselves against predators. With their unique appearances and fascinating behavior, cephalopod mollusks are creatures that continue to fascinate marine biologists and nature enthusiasts to this day.