blueberry vs shrub

blueberry and shrub both are nouns.

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

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

blueberry: any of numerous shrubs of the genus Vaccinium bearing blueberries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of blueberry include bush.

blueberry (noun)	shrub (noun)
sweet edible dark-blue berries of either low-growing or high-growing blueberry plants	a low woody perennial plant usually having several major stems
any of numerous shrubs of the genus Vaccinium bearing blueberries