isle /aɪl/ noun [countable]
[Date: 1200-1300; Language: Old French; Origin: Latin insula 'island']
a word for an island, used in poetry or in names of islands:
the British Isles

[TahlilGaran] Dictionary of Contemporary English ▲

island a piece of land completely surrounded by water:
We visited the Greek island of Kos.
In the centre of a lake is a small island.
isle an island – used in poetry or in names of islands:
The horse carried him to the windswept isle of Bujan.
It is the most southerly point in the British Isles.
the Windward Isles
the Isle of Wight
peninsula a piece of land almost completely surrounded by water but joined to a large area of land:
There is a coastal path around the peninsula.
the Korean peninsula
archipelago a group of small islands that are in a line:
He lives on an island at the eastern end of the Indonesian archipelago.

[TahlilGaran] English Thesaurus ▲