Lagerstroemia indica vs shrub

Lagerstroemia indica and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lagerstroemia indica	Yes	No	No	No
shrub	Yes	No	No	No

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

Lagerstroemia indica: ornamental shrub from eastern India commonly planted in the southern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Lagerstroemia indica include bush.

Lagerstroemia indica (noun)	shrub (noun)
ornamental shrub from eastern India commonly planted in the southern United States	a low woody perennial plant usually having several major stems