pilot ladder vs jack ladder

pilot ladder and jack ladder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot ladder	Yes	No	No	No
jack ladder	Yes	No	No	No

As nouns, pilot ladder and jack ladder are synonyms defined as:

pilot ladder and jack ladder: (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps

Other synonyms of pilot ladder include Jacob's ladder.

pilot ladder (noun)	jack ladder (noun)
(nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps	(nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps