Christmas berry vs bush

Christmas berry and bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
Christmas berry	Yes	No	No	No
bush	Yes	Yes	Yes	No

As nouns, bush is a hypernym of Christmas berry; that is, bush is a word with a broader meaning than Christmas berry:

Christmas berry: 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
bush: a low woody perennial plant usually having several major stems

Other hypernyms of Christmas berry include shrub.

As nouns, bush is a hypernym of Christmas berry; that is, bush is a word with a broader meaning than Christmas berry:

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

Other hypernyms of Christmas berry include shrub.

Christmas berry (noun)	bush (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	hair growing in the pubic area
spiny evergreen shrub of southeastern United States having spreading branches usually blue or mauve flowers and red berries	dense vegetation consisting of stunted trees or bushes
	a large wilderness area
	a low woody perennial plant usually having several major stems

Christmas berry (adjective)	bush (adjective)
	not of the highest quality or sophistication

Christmas berry (verb)	bush (verb)
	provide with a bushing