bush poppy vs shrub

bush poppy and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
bush poppy	Yes	No	No	No
shrub	Yes	No	No	No

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

bush poppy: evergreen shrub of southwestern United States and Mexico often cultivated for its fragrant golden yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of bush poppy include bush.

bush poppy (noun)	shrub (noun)
evergreen shrub of southwestern United States and Mexico often cultivated for its fragrant golden yellow flowers	a low woody perennial plant usually having several major stems