Ardisia crenata vs shrub

Ardisia crenata and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ardisia crenata	Yes	No	No	No
shrub	Yes	No	No	No

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

Other hypernyms of Ardisia crenata include bush.

Ardisia crenata (noun)	shrub (noun)
shrub with coral-red berries; Japan to northern India	a low woody perennial plant usually having several major stems