Xylosma congestum vs shrub

Xylosma congestum and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xylosma congestum	Yes	No	No	No
shrub	Yes	No	No	No

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

Xylosma congestum: shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Xylosma congestum include bush.

Xylosma congestum (noun)	shrub (noun)
shrub or small tree grown as an ornamental in mild climates for its neat evergreen foliage and fragrant late flowers; native of China	a low woody perennial plant usually having several major stems