Sambucus caerulea vs blue elderberry

Sambucus caerulea and blue elderberry both are nouns.

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

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

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

Other synonyms of Sambucus caerulea include blue elder.

Sambucus caerulea (noun)	blue elderberry (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