Robinia hispida vs shrub

Robinia hispida and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Robinia hispida	Yes	No	No	No
shrub	Yes	No	No	No

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

Robinia hispida: large shrub or small tree of the eastern United States having bristly stems and large clusters of pink flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Robinia hispida include bush.

Robinia hispida (noun)	shrub (noun)
large shrub or small tree of the eastern United States having bristly stems and large clusters of pink flowers	a low woody perennial plant usually having several major stems