flight
stairs
Flight of stairs and Fleet of ships.
stairs
A group of stairs is referred to as a flight. Example in a sentence- I followed him up a flight of stairs.
volley of savages string of pearls flight of stairs cache of arms
They're not called stairs. They're called steps. Stairs are indoors. Steps are out doors.
Flight
A common noun for a group of stairs is "staircase." It refers to a set of stairs that connect different levels of a building or structure. Other terms that can be used include "stairway" or "flight of stairs." These nouns are not capitalized unless they begin a sentence.
It is called a stile.
Risers.
Along the stairs that run along group 13 to group 17
They could be known as either a stairway, staircase, stairwell, or a flight of stairs.