Prunus vs European bird cherry

Prunus and European bird cherry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus	Yes	No	No	No
European bird cherry	Yes	No	No	No

Prunus (noun)	European bird cherry (noun)
a genus of shrubs and trees of the family Rosaceae that is widely distributed in temperate regions	small European cherry tree closely resembling the American chokecherry