moving staircase vs stairway

moving staircase and stairway both are nouns.

Word	Noun	Adjective	Verb	Adverb
moving staircase	Yes	No	No	No
stairway	Yes	No	No	No

As nouns, stairway is a hypernym of moving staircase; that is, stairway is a word with a broader meaning than moving staircase:

moving staircase: a stairway whose steps move continuously on a circulating belt
stairway: a way of access (upward and downward) consisting of a set of steps

Other hypernyms of moving staircase include staircase.

moving staircase (noun)	stairway (noun)
a stairway whose steps move continuously on a circulating belt	a way of access (upward and downward) consisting of a set of steps