huckleberry vs shrub

huckleberry and shrub both are nouns.

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

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

huckleberry: any of several shrubs of the genus Gaylussacia bearing small berries resembling blueberries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of huckleberry include bush.

huckleberry (noun)	shrub (noun)
blue-black berry similar to blueberries and bilberries of the eastern United States	a low woody perennial plant usually having several major stems
any of several shrubs of the genus Gaylussacia bearing small berries resembling blueberries
any of various dark-fruited as distinguished from blue-fruited blueberries