Island
An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, such as the Philippines.
Island
Greenland is the world's largest island, with an area of over 2.1 million km, while Australia, the world's smallest continent, has an area of 7.6 million km, but there is no standard of size that distinguishes islands from continents, or from islets.