Juneberry vs shrub

Juneberry and shrub both are nouns.

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

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

Juneberry: any of various North American trees or shrubs having showy white flowers and edible blue-black or purplish fruit
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Juneberry include bush.

Juneberry (noun)	shrub (noun)
any of various North American trees or shrubs having showy white flowers and edible blue-black or purplish fruit	a low woody perennial plant usually having several major stems