deerberry vs blueberry bush

deerberry and blueberry bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
deerberry	Yes	No	No	No
blueberry bush	Yes	No	No	No

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

deerberry: small branching blueberry common in marshy areas of the eastern United States having greenish or yellowish unpalatable berries reputedly eaten by deer
blueberry bush: any of numerous shrubs of the genus Vaccinium bearing blueberries

Other hypernyms of deerberry include blueberry.

deerberry (noun)	blueberry bush (noun)
small branching blueberry common in marshy areas of the eastern United States having greenish or yellowish unpalatable berries reputedly eaten by deer	any of numerous shrubs of the genus Vaccinium bearing blueberries