Japanese angelica tree vs shrub

Japanese angelica tree and shrub both are nouns.

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

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

Japanese angelica tree: deciduous clump-forming Asian shrub or small tree; adventive in the eastern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Japanese angelica tree include bush.

Japanese angelica tree (noun)	shrub (noun)
deciduous clump-forming Asian shrub or small tree; adventive in the eastern United States	a low woody perennial plant usually having several major stems