blaeberry vs blueberry bush

blaeberry and blueberry bush both are nouns.

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

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

blaeberry: erect European blueberry having solitary flowers and blue-black berries
blueberry bush: any of numerous shrubs of the genus Vaccinium bearing blueberries

Other hypernyms of blaeberry include blueberry.

blaeberry (noun)	blueberry bush (noun)
erect European blueberry having solitary flowers and blue-black berries	any of numerous shrubs of the genus Vaccinium bearing blueberries