Cercis occidentalis vs shrub

Cercis occidentalis and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cercis occidentalis	Yes	No	No	No
shrub	Yes	No	No	No

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

Cercis occidentalis: shrub of western United States having pink or crimson flowers; often forms thickets
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Cercis occidentalis include bush.

Cercis occidentalis (noun)	shrub (noun)
shrub of western United States having pink or crimson flowers; often forms thickets	a low woody perennial plant usually having several major stems