highbush cranberry vs shrub

highbush cranberry and shrub both are nouns.

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

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

highbush cranberry: deciduous North American shrub or small tree having three-lobed leaves and red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of highbush cranberry include bush.

highbush cranberry (noun)	shrub (noun)
deciduous North American shrub or small tree having three-lobed leaves and red berries	a low woody perennial plant usually having several major stems