The term 'Reef Denizen' refers to the various species of animals that inhabit coral reefs. Two of the most common reef denizens are the MORAY (5 letters) and the MANTA (5 letters). The MORAY is a large, predatory fish that can be found in tropical and subtropical oceans around the world. The MANTA is a large, graceful ray that is found in warm, shallow waters. Another common reef denizen is the EEL (3 letters), which is a long, snake-like fish that can be found in both saltwater and freshwater habitats. All three of these creatures are important members of the coral reef ecosystem.