blue elderberry vs Sambucus caerulea

blue elderberry and Sambucus caerulea both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue elderberry	Yes	No	No	No
Sambucus caerulea	Yes	No	No	No

As nouns, blue elderberry and Sambucus caerulea are synonyms defined as:

blue elderberry and Sambucus caerulea: shrub or small tree of western United States having white flowers and blue berries; fruit used in wines and jellies

Other synonyms of blue elderberry include blue elder.

blue elderberry (noun)	Sambucus caerulea (noun)
shrub or small tree of western United States having white flowers and blue berries; fruit used in wines and jellies	shrub or small tree of western United States having white flowers and blue berries; fruit used in wines and jellies