flight of steps vs flight of stairs

flight of steps and flight of stairs both are nouns.

Word	Noun	Adjective	Verb	Adverb
flight of steps	Yes	No	No	No
flight of stairs	Yes	No	No	No

As nouns, flight of steps and flight of stairs are synonyms defined as:

flight of steps and flight of stairs: a stairway (set of steps) between one floor or landing and the next

Other synonyms of flight of steps include flight.

flight of steps (noun)	flight of stairs (noun)
a stairway (set of steps) between one floor or landing and the next	a stairway (set of steps) between one floor or landing and the next