Xylomelum pyriforme vs shrub

Xylomelum pyriforme and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xylomelum pyriforme	Yes	No	No	No
shrub	Yes	No	No	No

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

Xylomelum pyriforme: tree bearing pear-shaped fruit with a thick woody epicarp
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Xylomelum pyriforme include bush.

Xylomelum pyriforme (noun)	shrub (noun)
tree bearing pear-shaped fruit with a thick woody epicarp	a low woody perennial plant usually having several major stems