Aisle is a passageway or corridor; for example: a narrow aisle between two rows of seats; a path way: “The aisle was crammed with people.”, “brides walk down the aisle in the church when they are getting married”.
Isle, on other hand, is a very small island, an islet: “only the super rich can afford private isles of their own.”
Usage example that uses these 2 words: After walking down the aisle, the bride and the groom left for their honeymoon on the isle.