black elderberry vs elderberry

black elderberry and elderberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
black elderberry	Yes	No	No	No
elderberry	Yes	No	No	No

black elderberry (noun)	elderberry (noun)
common elder of central and eastern North America bearing purple-black berries; fruit used in wines and jellies	berrylike fruit of an elder used for e.g. wines and jellies
	a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies