stairway
n. countable A2 Elementary US //ˈstɛɹˌweɪ// UK //stˈeəweɪ// stair·way
n. a set of steps that you use to go from one floor of a building to another. It is usually inside a house or an office.
n. a set of steps, including the supporting structure and handrails, providing access between different levels of a building.
The wooden stairway leads to the second floor.
The architect designed a wide, spiral stairway to serve as the central feature of the hotel lobby.
Emergency protocols require that the stairway remain clear of obstructions at all times to ensure a rapid evacuation during a fire or other building crisis.
stair + way
Usage
Often used interchangeably with 'staircase', though 'stairway' more frequently refers to the entire passage or route.