blueberry bush vs blueberry

blueberry bush and blueberry both are nouns.

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

As nouns, blueberry bush and blueberry are synonyms defined as:

blueberry bush and blueberry: any of numerous shrubs of the genus Vaccinium bearing blueberries

blueberry bush (noun)	blueberry (noun)
any of numerous shrubs of the genus Vaccinium bearing blueberries	sweet edible dark-blue berries of either low-growing or high-growing blueberry plants
	any of numerous shrubs of the genus Vaccinium bearing blueberries