isle vs island

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Answers:

An isle is an island, land surrounded by water. The term is very common in British English. However, there is no clear agreement on what makes an island an isle or its difference, so they are considered synonyms. *
They are considered synonyms, and from what I know, they don’t have a real difference in meaning. *
To me they are synonymous. “Isle” feels more poetic and old-fashioned. I would personally never use it in everyday conversation except when it is part of a placename. Isle of Man, British Isles etc. *
They are the same, but their origins were seperate. Isle came from Latin. Island came from Germanic. It seems that island got the s in writing to imitate isle, and isle lost the s in pronunciation to imitate island. *