coral - marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs

Gorgonacea, Gorgoniacea, suborder Gorgonacea, suborder Gorgoniacea - red corals and sea fans

sea feather - corals forming featherlike colonies

sea fan - corals having a treelike or fan-shaped horny skeleton

red coral - corals of especially the Mediterranean having pink or red color used for ornaments and jewelry