black elder vs Sambucus nigra

black elder and Sambucus nigra both are nouns.

Word	Noun	Adjective	Verb	Adverb
black elder	Yes	No	No	No
Sambucus nigra	Yes	No	No	No

As nouns, black elder and Sambucus nigra are synonyms defined as:

black elder and Sambucus nigra: 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, European elder.

black elder (noun)	Sambucus nigra (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