Batis maritima vs shrub

Batis maritima and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Batis maritima	Yes	No	No	No
shrub	Yes	No	No	No

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

Batis maritima: low-growing strong-smelling coastal shrub of warm parts of the New World having unisexual flowers in conelike spikes and thick succulent leaves
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Batis maritima include bush.

Batis maritima (noun)	shrub (noun)
low-growing strong-smelling coastal shrub of warm parts of the New World having unisexual flowers in conelike spikes and thick succulent leaves	a low woody perennial plant usually having several major stems