Cephalopods are a class of marine animals that comprise of creatures like octopuses, squid, and cuttlefish. Also known as invertebrates, these aquatic organisms boast unique features like a well-developed nervous system, eight or ten arms, and an expert camouflaging ability. However, if you're looking for a different way of referring to cephalopods in your writing, you can use synonyms like mollusks or head-footed animals. Other terms you can use include marine invertebrates, squid-like creatures, and tentacled invertebrates. Whatever term you choose to use to describe these fascinating creatures, you can't deny that they're some of the most intriguing and awe-inspiring animals in the ocean.