Prunus besseyi vs suffrutex

Prunus besseyi and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus besseyi	Yes	No	No	No
suffrutex	Yes	No	No	No

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

Prunus besseyi: dwarf ornamental shrub of western United States having large black to red and yellow sweet edible fruit
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of Prunus besseyi include subshrub.

Prunus besseyi (noun)	suffrutex (noun)
dwarf ornamental shrub of western United States having large black to red and yellow sweet edible fruit	low-growing woody shrub or perennial with woody base