moving stairway vs moving staircase

moving stairway and moving staircase both are nouns.

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

As nouns, moving stairway and moving staircase are synonyms defined as:

moving stairway and moving staircase: a stairway whose steps move continuously on a circulating belt

Other synonyms of moving stairway include escalator.

moving stairway (noun)	moving staircase (noun)
a stairway whose steps move continuously on a circulating belt	a stairway whose steps move continuously on a circulating belt