marlberry vs shrub

marlberry and shrub both are nouns.

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

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

marlberry: tropical American shrub or small tree with brown wood and dark berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of marlberry include bush.

marlberry (noun)	shrub (noun)
tropical American shrub or small tree with brown wood and dark berries	a low woody perennial plant usually having several major stems