barberry vs shrub

barberry and shrub both are nouns.

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

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

barberry: any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of barberry include bush.

barberry (noun)	shrub (noun)
any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries	a low woody perennial plant usually having several major stems