Ctetology refers to the scientific study of cephalopods, which includes octopuses, squids, and cuttlefish. While there are not many direct synonyms for ctetology, some related terms could include marine biology, zoology, or even invertebrate zoology. These fields of study also involve the examination of animals that live in or near the ocean, but they may not focus specifically on cephalopods. Some other words that may be associated with ctetology are mollusks, aquatic animals, and marine ecology. Regardless of the terminology used, the study of cephalopods is an important field that helps us better understand the creatures living in our oceans.