Jacob's rod vs asphodel

Jacob's rod and asphodel both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jacob's rod	Yes	No	No	No
asphodel	Yes	No	No	No

As nouns, asphodel is a hypernym of Jacob's rod; that is, asphodel is a word with a broader meaning than Jacob's rod:

Jacob's rod: asphodel having erect smooth unbranched stem either flexuous or straight
asphodel: any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers

Jacob's rod (noun)	asphodel (noun)
asphodel having erect smooth unbranched stem either flexuous or straight	any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers