crowberry vs shrub

crowberry and shrub both are nouns.

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

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

crowberry: a low evergreen shrub with small purple flowers and black berrylike fruit
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of crowberry include bush.

crowberry (noun)	shrub (noun)
a low evergreen shrub with small purple flowers and black berrylike fruit	a low woody perennial plant usually having several major stems