Viburnum prunifolium vs shrub

Viburnum prunifolium and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Viburnum prunifolium	Yes	No	No	No
shrub	Yes	No	No	No

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

Viburnum prunifolium: upright deciduous shrub having frosted dark-blue fruit; east and east central North America
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Viburnum prunifolium include bush.

Viburnum prunifolium (noun)	shrub (noun)
upright deciduous shrub having frosted dark-blue fruit; east and east central North America	a low woody perennial plant usually having several major stems