common flat pea vs shrub

common flat pea and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
common flat pea	Yes	No	No	No
shrub	Yes	No	No	No

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

common flat pea: low spreading evergreen shrub of southern Australia having triangular to somewhat heart-shaped foliage and orange-yellow flowers followed by flat winged pods
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of common flat pea include bush.

common flat pea (noun)	shrub (noun)
low spreading evergreen shrub of southern Australia having triangular to somewhat heart-shaped foliage and orange-yellow flowers followed by flat winged pods	a low woody perennial plant usually having several major stems