chaparral pea vs shrub

chaparral pea and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
chaparral pea	Yes	No	No	No
shrub	Yes	No	No	No

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

chaparral pea: spiny evergreen xerophytic shrub having showy rose and purple flowers and forming dense thickets; of dry rocky mountain slopes of California
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of chaparral pea include bush.

chaparral pea (noun)	shrub (noun)
spiny evergreen xerophytic shrub having showy rose and purple flowers and forming dense thickets; of dry rocky mountain slopes of California	a low woody perennial plant usually having several major stems