moving stairway vs staircase

moving stairway and staircase both are nouns.

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

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

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

Other hypernyms of moving stairway include stairway.

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