What is another word for atoll?
Pronunciation: [ˈatɒl] (IPA) 
Atoll is a term used to describe a ring-shaped coral island or a reef, enclosing a lagoon. Some synonyms for this word include coral atoll, coral island, reef, lagoon island and cay. While atolls are commonly formed in tropical regions, other synonyms for this term such as coral island and reef can also be used to describe such features in other regions, including the Pacific and Atlantic Oceans. Coral atoll is often used interchangeably with atoll, considering that the latter term denotes the shape of a coral island, it may be more accurate to refer to an atoll as a coral atoll, to distinguish it from other types of atolls or islands.
