privet vs shrub

privet and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
privet	Yes	No	No	No
shrub	Yes	No	No	No

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

privet: any of various Old World shrubs having smooth entire leaves and terminal panicles of small white flowers followed by small black berries; many used for hedges
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of privet include bush.

privet (noun)	shrub (noun)
any of various Old World shrubs having smooth entire leaves and terminal panicles of small white flowers followed by small black berries; many used for hedges	a low woody perennial plant usually having several major stems