poison arrow plant vs shrub

poison arrow plant and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
poison arrow plant	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of poison arrow plant; that is, shrub is a word with a broader meaning than poison arrow plant:

poison arrow plant: medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of poison arrow plant include bush.

poison arrow plant (noun)	shrub (noun)
medium-sized shrubby tree of South Africa having thick leathery evergreen leaves and white or pink flowers and globose usually two-seeded purplish black fruits	a low woody perennial plant usually having several major stems