island

A contiguous area of land, smaller than a continent, totally surrounded by water.

An entity surrounded by other entities that are very different from itself.

“an island of colors on a butterfly's wing”

A superstructure on an aircraft carrier's deck.

A traffic island.

“the island in the middle of a roundabout”

An unincorporated area wholly surrounded by one or more incorporated areas.

(grammar) A phrase from which a wh-word cannot be extracted without yielding invalid grammar.

To surround with water; make into an island.

To set, dot (as if) with islands.

To isolate.