tree lupine vs shrub

tree lupine and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree lupine	Yes	No	No	No
shrub	Yes	No	No	No

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

tree lupine: evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of tree lupine include bush.

tree lupine (noun)	shrub (noun)
evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia	a low woody perennial plant usually having several major stems