noun
fellow guest; fellow lodger; fellow passenger
Refers to someone sharing the same accommodation, inn, or vehicle as a fellow customer. Often used in travel or lodging contexts.
旅館で相客と世間話をした。
I chatted with a fellow guest at the inn.
夜行バスで隣の相客がずっと寝ていた。
On the night bus, the fellow passenger next to me slept the whole time.