Datura arborea vs shrub

Datura arborea and shrub both are nouns.

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

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

Datura arborea: a South American plant that is cultivated for its large fragrant trumpet-shaped flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Datura arborea include bush.

Datura arborea (noun)	shrub (noun)
a South American plant that is cultivated for its large fragrant trumpet-shaped flowers	a low woody perennial plant usually having several major stems