Jacquinia keyensis vs shrub

Jacquinia keyensis and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jacquinia keyensis	Yes	No	No	No
shrub	Yes	No	No	No

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

Jacquinia keyensis: West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Jacquinia keyensis include bush.

Jacquinia keyensis (noun)	shrub (noun)
West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood	a low woody perennial plant usually having several major stems