crape myrtle vs shrub

crape myrtle and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
crape myrtle	Yes	No	No	No
shrub	Yes	No	No	No

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

crape myrtle: 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 crape myrtle include bush.

crape myrtle (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