Caesalpinia sepiaria vs shrub

Caesalpinia sepiaria and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Caesalpinia sepiaria	Yes	No	No	No
shrub	Yes	No	No	No

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

Caesalpinia sepiaria: spreading thorny shrub of tropical Asia bearing large erect racemes of red-marked yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Caesalpinia sepiaria include bush.

Caesalpinia sepiaria (noun)	shrub (noun)
spreading thorny shrub of tropical Asia bearing large erect racemes of red-marked yellow flowers	a low woody perennial plant usually having several major stems