Senecio cineraria vs shrub

Senecio cineraria and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Senecio cineraria	Yes	No	No	No
shrub	Yes	No	No	No

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

Senecio cineraria: 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 Senecio cineraria include bush.

Senecio cineraria (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