Vaccinium arboreum vs blueberry

Vaccinium arboreum and blueberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vaccinium arboreum	Yes	No	No	No
blueberry	Yes	No	No	No

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

Vaccinium arboreum: shrub or small tree of eastern United States having black inedible berries
blueberry: any of numerous shrubs of the genus Vaccinium bearing blueberries

Other hypernyms of Vaccinium arboreum include blueberry bush.

Vaccinium arboreum (noun)	blueberry (noun)
shrub or small tree of eastern United States having black inedible berries	sweet edible dark-blue berries of either low-growing or high-growing blueberry plants
	any of numerous shrubs of the genus Vaccinium bearing blueberries