If it stands alone disconnected from any other land mass it is an island.
An island is an area of land that is smaller than a continent, and is completely surrounded by water. The world's largest island is Greenland.
An area of land that is smaller than a continent is called a country. Countries are political entities that are typically smaller than continents and have defined borders, governments, and often unique cultures.
lake
An island.
An Island
an island
That would be an island.
An Island.
Island?
An Island.
Hawaii
An Island.