Viburnum opulus vs shrub

Viburnum opulus and shrub both are nouns.

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

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

Viburnum opulus: deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Viburnum opulus include bush.

Viburnum opulus (noun)	shrub (noun)
deciduous thicket-forming Old World shrub with clusters of white flowers and small bright red berries	a low woody perennial plant usually having several major stems