Cineraria maritima vs shrub

Cineraria maritima and shrub both are nouns.

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

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

Cineraria maritima: stiff much-branched perennial of the Mediterranean region having very white woolly stems and leaves
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Cineraria maritima include bush.

Cineraria maritima (noun)	shrub (noun)
stiff much-branched perennial of the Mediterranean region having very white woolly stems and leaves	a low woody perennial plant usually having several major stems