Madagascar plum vs shrub

Madagascar plum and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Madagascar plum	Yes	No	No	No
shrub	Yes	No	No	No

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

Madagascar plum: small shrubby tree of Madagascar cultivated in tropical regions as a hedge plant and for its deep red acid fruits resembling small plums
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Madagascar plum include bush.

Madagascar plum (noun)	shrub (noun)
small shrubby tree of Madagascar cultivated in tropical regions as a hedge plant and for its deep red acid fruits resembling small plums	a low woody perennial plant usually having several major stems