Chilopsis linearis vs shrub

Chilopsis linearis and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chilopsis linearis	Yes	No	No	No
shrub	Yes	No	No	No

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

Chilopsis linearis: evergreen shrubby tree resembling a willow of dry regions of southwestern North America having showy purplish flowers and long seed pods
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Chilopsis linearis include bush.

Chilopsis linearis (noun)	shrub (noun)
evergreen shrubby tree resembling a willow of dry regions of southwestern North America having showy purplish flowers and long seed pods	a low woody perennial plant usually having several major stems