noun
island language; island dialect
Refers to the distinctive language or dialect spoken on a particular island, often with unique vocabulary and expressions.
沖縄の島言葉には、本土の日本語と違う単語がたくさんある。
The island dialect of Okinawa has many words that differ from mainland Japanese.
祖母は島言葉で話すことが多い。
My grandmother often speaks in the island dialect.
方言 is a general term for any regional dialect, while 島言葉 specifically refers to the language of an island community.
Compound of 島 (island) and 言葉 (language, speech).