Datura suaveolens vs shrub

Datura suaveolens and shrub both are nouns.

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

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

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

Other hypernyms of Datura suaveolens include bush.

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