Lupinus perennis vs suffrutex

Lupinus perennis and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lupinus perennis	Yes	No	No	No
suffrutex	Yes	No	No	No

As nouns, suffrutex is a hypernym of Lupinus perennis; that is, suffrutex is a word with a broader meaning than Lupinus perennis:

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

Other hypernyms of Lupinus perennis include subshrub.

Lupinus perennis (noun)	suffrutex (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