Dryas octopetala vs suffrutex

Dryas octopetala and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dryas octopetala	Yes	No	No	No
suffrutex	Yes	No	No	No

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

Dryas octopetala: creeping evergreen shrub with large white flowers; widely distributed in northern portions of Eurasia and North America
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of Dryas octopetala include subshrub.

Dryas octopetala (noun)	suffrutex (noun)
creeping evergreen shrub with large white flowers; widely distributed in northern portions of Eurasia and North America	low-growing woody shrub or perennial with woody base