Mahonia aquifolium vs shrub

Mahonia aquifolium and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mahonia aquifolium	Yes	No	No	No
shrub	Yes	No	No	No

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

Mahonia aquifolium: ornamental evergreen shrub of Pacific coast of North America having dark green pinnate leaves and racemes of yellow flowers followed by blue-black berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Mahonia aquifolium include bush.

Mahonia aquifolium (noun)	shrub (noun)
ornamental evergreen shrub of Pacific coast of North America having dark green pinnate leaves and racemes of yellow flowers followed by blue-black berries	a low woody perennial plant usually having several major stems