Datura sanguinea vs shrub

Datura sanguinea and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Datura sanguinea	Yes	No	No	No
shrub	Yes	No	No	No

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

Datura sanguinea: arborescent South American shrub having very large orange-red flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Datura sanguinea include bush.

Datura sanguinea (noun)	shrub (noun)
arborescent South American shrub having very large orange-red flowers	a low woody perennial plant usually having several major stems