Christmasberry vs shrub

Christmasberry and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Christmasberry	Yes	No	No	No
shrub	Yes	No	No	No

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

Christmasberry: ornamental evergreen treelike shrub of the Pacific coast of the United States having large white flowers and red berrylike fruits; often placed in genus Photinia
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Christmasberry include bush.

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

Christmasberry: spiny evergreen shrub of southeastern United States having spreading branches usually blue or mauve flowers and red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Christmasberry include bush.

Christmasberry (noun)	shrub (noun)
ornamental evergreen treelike shrub of the Pacific coast of the United States having large white flowers and red berrylike fruits; often placed in genus Photinia	a low woody perennial plant usually having several major stems
spiny evergreen shrub of southeastern United States having spreading branches usually blue or mauve flowers and red berries