common barberry vs barberry

common barberry and barberry both are nouns.

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

As nouns, barberry is a hypernym of common barberry; that is, barberry is a word with a broader meaning than common barberry:

common barberry: upright deciduous European shrub widely naturalized in United States having clusters of juicy berries
barberry: any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries

common barberry (noun)	barberry (noun)
upright deciduous European shrub widely naturalized in United States having clusters of juicy berries	any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries