moving stairway vs stairway

moving stairway and stairway both are nouns.

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

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

moving stairway: 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 stairway include staircase.

moving stairway (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