common barberry vs Berberis vulgaris

common barberry and Berberis vulgaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
common barberry	Yes	No	No	No
Berberis vulgaris	Yes	No	No	No

As nouns, common barberry and Berberis vulgaris are synonyms defined as:

common barberry and Berberis vulgaris: upright deciduous European shrub widely naturalized in United States having clusters of juicy berries

Other synonyms of common barberry include European barberry.

common barberry (noun)	Berberis vulgaris (noun)
upright deciduous European shrub widely naturalized in United States having clusters of juicy berries	upright deciduous European shrub widely naturalized in United States having clusters of juicy berries