blueberry root vs shrub

blueberry root and shrub both are nouns.

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

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

blueberry root: tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of blueberry root include bush.

blueberry root (noun)	shrub (noun)
tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally	a low woody perennial plant usually having several major stems