Grewia asiatica vs shrub

Grewia asiatica and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Grewia asiatica	Yes	No	No	No
shrub	Yes	No	No	No

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

Grewia asiatica: drought-resistant Asiatic treelike shrub bearing pleasantly acid small red edible fruits commonly used in sherbets
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Grewia asiatica include bush.

Grewia asiatica (noun)	shrub (noun)
drought-resistant Asiatic treelike shrub bearing pleasantly acid small red edible fruits commonly used in sherbets	a low woody perennial plant usually having several major stems