Akademik

stairs
noun
a flight of stairs or a flight of steps (Freq. 15)
Syn: ↑steps
Usage Domain: ↑plural, ↑plural form
Hypernyms: ↑stairway, ↑staircase
Hyponyms: ↑ladder

* * *

'step'
A step is a raised flat surface which you put your feet on to move to a different level.

Mind the step.

She was sitting on the top step.

\
A series of steps, for example on a steep slope or on the outside of a building, is called a flight of steps.

...a flight of concrete steps.

\
'stairs'
A series of steps inside a building which you use to get from one floor to another is called stairs or a staircase.

I was running up and down the stairs.

There was a large hall with a big staircase winding up from it.

\

Useful english dictionary. 2012.