common elder vs Sambucus nigra

common elder and Sambucus nigra both are nouns.

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

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

common 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 common elder include black elder, bourtree, elderberry, European elder.

common 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