cabin; stateroom
Refers to a passenger cabin or private room on a ship or ferry.
フェリーの船室を予約した。
I reserved a cabin on the ferry.
船室からデッキに出て夕日を見た。
I went out from the cabin to the deck and watched the sunset.
I booked a cabin on the ferry early.
We toured the islands while staying in cabins on the ship.
After the meal, I went back to my cabin to rest.