Thevetia peruviana vs shrub

Thevetia peruviana and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thevetia peruviana	Yes	No	No	No
shrub	Yes	No	No	No

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

Thevetia peruviana: tropical American shrub or small tree having glossy dark green leaves and fragrant saffron yellow to orange or peach- colored flowers; all parts highly poisonous
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Thevetia peruviana include bush.

Thevetia peruviana (noun)	shrub (noun)
tropical American shrub or small tree having glossy dark green leaves and fragrant saffron yellow to orange or peach- colored flowers; all parts highly poisonous	a low woody perennial plant usually having several major stems