kidney wort vs shrub

kidney wort and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
kidney wort	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of kidney wort; that is, shrub is a word with a broader meaning than kidney wort:

kidney wort: widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of kidney wort include bush.

kidney wort (noun)	shrub (noun)
widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle	a low woody perennial plant usually having several major stems