wild lupine vs subshrub

wild lupine and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild lupine	Yes	No	No	No
subshrub	Yes	No	No	No

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

wild lupine: stout perennial of eastern and central North America having palmate leaves and showy racemose blue flowers
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of wild lupine include suffrutex.

wild lupine (noun)	subshrub (noun)
stout perennial of eastern and central North America having palmate leaves and showy racemose blue flowers	low-growing woody shrub or perennial with woody base