blue cohosh vs shrub

blue cohosh and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue cohosh	Yes	No	No	No
shrub	Yes	No	No	No

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

blue cohosh: 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 blue cohosh include bush.

blue cohosh (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