asphodel vs Jacob's rod

asphodel and Jacob's rod both are nouns.

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

As nouns, Jacob's rod is a hyponym of asphodel; that is, Jacob's rod is a word with a more specific, narrower meaning than asphodel:

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: asphodel having erect smooth unbranched stem either flexuous or straight

Other hyponyms of asphodel include Asphodeline lutea, king's spear, yellow asphodel.

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