California beauty vs shrub

California beauty and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
California beauty	Yes	No	No	No
shrub	Yes	No	No	No

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

California beauty: any of several handsome evergreen shrubs of California and northern Mexico having downy lobed leaves and showy yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of California beauty include bush.

California beauty (noun)	shrub (noun)
any of several handsome evergreen shrubs of California and northern Mexico having downy lobed leaves and showy yellow flowers	a low woody perennial plant usually having several major stems