American angelica tree vs shrub

American angelica tree and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
American angelica tree	Yes	No	No	No
shrub	Yes	No	No	No

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

American angelica tree: small deciduous clump-forming tree or shrub of eastern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of American angelica tree include bush.

American angelica tree (noun)	shrub (noun)
small deciduous clump-forming tree or shrub of eastern United States	a low woody perennial plant usually having several major stems