cranberry vs shrub

cranberry and shrub both are nouns.

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

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

Other hypernyms of cranberry include bush.

cranberry (noun)	shrub (noun)
very tart red berry used for sauce or juice	a low woody perennial plant usually having several major stems
any of numerous shrubs of genus Vaccinium bearing cranberries