black elder vs European elder

black elder and European elder both are nouns.

Word	Noun	Adjective	Verb	Adverb
black elder	Yes	No	No	No
European elder	Yes	No	No	No

As nouns, black elder and European elder are synonyms defined as:

black elder and European elder: a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies

Other synonyms of black elder include bourtree, common elder, elderberry, Sambucus nigra.

black elder (noun)	European elder (noun)
a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies	a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies