European bird cherry vs Prunus

European bird cherry and Prunus both are nouns.

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

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