pilot ladder vs Jacob's ladder

pilot ladder and Jacob's ladder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot ladder	Yes	No	No	No
Jacob's ladder	Yes	No	No	No

As nouns, pilot ladder and Jacob's ladder are synonyms defined as:

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

Other synonyms of pilot ladder include jack ladder.

pilot ladder (noun)	Jacob's 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
	pinnate-leaved European perennial having bright blue or white flowers