Comptonia peregrina vs shrub

Comptonia peregrina and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Comptonia peregrina	Yes	No	No	No
shrub	Yes	No	No	No

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

Comptonia peregrina: deciduous shrub of eastern North America with sweet scented fernlike leaves and tiny white flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Comptonia peregrina include bush.

Comptonia peregrina (noun)	shrub (noun)
deciduous shrub of eastern North America with sweet scented fernlike leaves and tiny white flowers	a low woody perennial plant usually having several major stems