moving stairway vs escalator

moving stairway and escalator both are nouns.

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

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

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

Other synonyms of moving stairway include moving staircase.

moving stairway (noun)	escalator (noun)
a stairway whose steps move continuously on a circulating belt	a stairway whose steps move continuously on a circulating belt
	a clause in a contract that provides for an increase or a decrease in wages or prices or benefits etc. depending on certain conditions (as a change in the cost of living index)