escalator vs moving staircase

escalator and moving staircase both are nouns.

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

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

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

Other synonyms of escalator include moving stairway.

escalator (noun)	moving staircase (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)