moving staircase vs escalator

moving staircase and escalator both are nouns.

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

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

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

Other synonyms of moving staircase include moving stairway.

moving staircase (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)