Jacob's ladder vs Greek valerian

Jacob's ladder and Greek valerian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jacob's ladder	Yes	No	No	No
Greek valerian	Yes	No	No	No

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

Jacob's ladder and Greek valerian: pinnate-leaved European perennial having bright blue or white flowers

Jacob's ladder (noun)	Greek valerian (noun)
(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
pinnate-leaved European perennial having bright blue or white flowers	erect or spreading perennial of the eastern United States